For the Love of God, GI Joe and John Wayne.... cleaning and abrasive cleaners

Been using a concoction of 2/1 Hoppes/ Free All, works pretty well on carbon, disclaimer, I brush a lot and soak for several days when possible.
All pictures are on the same groove just in front of the end of the chamber. Barrel is a 6 PPC Bartlein with 8-900 shots.
Barrel after a thorough cleaning with solvents and Rem 40 X before putting up for winter.
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After 28 shots recently, couple wet patches of H/FA, then 25 passes with a bronze brush immediately after firing the last shot at the range, then a 24hr soak.
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Wet patches of Montana Extreme Copper Killer followed by 25 brush strokes and a 15 minute soak.
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Decided to try a 24hr soak with the Copper Killer after brushing, same regimen as before but 24hr soak.
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Finally did another Hoppes/Free All brush and 24hr soak.
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The last session didn’t pull much more carbon but the first patch was definitely dirty. Going to try this routine for this upcoming season. The Copper Killer seems to do a better job than BT Eliminator but the Eliminator is old. Montana Extreme Copper Killer will knock your socks off when you open it!
 
If you really want to remove copper chemically (instead of with abrasives) the most effective remover I have found is Barnes CR-10. I have a tried a few other products, including Sweets 7.62, and it by far works the fastest and most thoroughly. It smells horrible, and shouldn't be left in the bore long term, but it will strip every last bit of copper out of the bore. It also seems to dissolve carbon to some degree as well, although it is not advertised to do so.
 
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Take this with a giant bag of salt, but for giggles I emailed Hoppe's (who turns out is owned by Bushnell) and asked their tech group about the changes to their formula over time and if it was still safe to leave in barrels long term as a protectant.

The first response I got was a bit odd, indicated the formula has not changed in as long as they could remember, but it turned out they thought I was referring to their oil product.

When I clarified that I meant the #9 bore cleaner the response was that it should never be left on any surface for too long, instead it should be removed and their oil should be used.

Now perhaps this Hoppe's tech support person had no idea what they were talking about, perhaps they just wanted to encourage someone to buy their oil and use more product who knows. However, considering the formula changes in 2019, and the fact someone else posted they could no longer find an ingredient that seemed to be a rust preventative in the current formula, it might not be a great idea to continue the old practice of leaving it barrels long term, at least if your #9 is newer than 2019.
 
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Take this with a giant bag of salt, but for giggles I emailed Hoppe's (who turns out is owned by Bushnell) and asked their tech group about the changes to their formula over time and if it was still safe to leave in barrels long term as a protectant.

The first response I got was a bit odd, indicated the formula has not changed in as long as they could remember, but it turned out they thought I was referring to their oil product.

When I clarified that I meant the #9 bore cleaner the response was that it should never be left on any surface for too long, instead it should be removed and their oil should be used.

Now perhaps this Hoppe's tech support person had no idea what they were talking about, perhaps they just wanted to encourage someone to buy their oil and use more product who knows. However, considering the formula changes in 2019, and the fact someone else posted they could no longer find an ingredient that seemed to be a rust preventative in the current formula, it might not be a great idea to continue the old practice of leaving it barrels long term, at least if your #9 is newer than 2019.
Pretty messed up for them to change the product that much (2016 version: 9 ingredients, 2019 version: 16 ingredients with major swap ins and outs between them) without even putting a "new and improved formula" label on it or anything.
 
Pretty messed up for them to change the product that much (2016 version: 9 ingredients, 2019 version: 16 ingredients with major swap ins and outs between them) without even putting a "new and improved formula" label on it or anything.
One thing that really seems to be taking a beating in the past 5 years is consumer protection. Used to be companies wouldn’t dare pull half the shit they pull now. Seems like it really went south with the fake pandemic….
 
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Yep companies got away with and are still getting away with tons of stuff now pretty much blame free because they convinced the world it was all covid's fault. Consumers as a whole just learned to accept and take high prices and poor QC/service and it's become the new standard. Don't get me wrong covid legitimately messed up a ton of industries for awhile, but it also gave a ton of companies a blame free path to reduce staff, cut corners, shrinkflate, and increase prices blame free. You won't find another 5 years in history that the S&P increased almost 3000 points, even if you don't count the initial covid drop 1000 point drop (it only took 8 months to recover that) it's still increased 2000+ points from pre-covid. Companies convinced the world they were the victim and down on their luck, meanwhile making record profits and their stock prices show it and in almost every case it's bad news for the consumer.

I just checked the I have about a 1/4 of a pint bottle left with a 2012 date on the label. I had bought another one last year, but given the new ingredients and info from Hoppe's I don't think I'll be doing my standard practice of leaving it in for long term storage after my old stuff is used up. I'll just do a barrel cleaning and use one of the protectant options. Esp. with what appear to be new carcinogens in the new formula (or at least the new MSDS sure is reporting more carcinogens, could be reporting requirements).

Many years ago I used to clean with wipe out, patch dry, and use Barricade as a final patch for storage. However I liked Frank's method I'd add in Rem 40x sometimes, making sure to get all that out and then leaving Hoppe's in long term so it would continue to clean and protect, and dry patching before a range trip. This new formula though it looks like I'll go back to using more of a protectant only in the barrel for long term.
 
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Yep companies got away with and are still getting away with tons of stuff now pretty much blame free because they convinced the world it was all covid's fault. Consumers as a whole just learned to accept and take high prices and poor QC/service and it's become the new standard. Don't get me wrong covid legitimately messed up a ton of industries for awhile, but it also gave a ton of companies a blame free path to reduce staff, cut corners, shrinkflate, and increase prices blame free. You won't find another 5 years in history that the S&P increased almost 3000 points, even if you don't count the initial covid drop 1000 point drop (it only took 8 months to recover that) it's still increased 2000+ points from pre-covid. Companies convinced the world they were the victim and down on their luck, meanwhile making record profits and their stock prices show it and in almost every case it's bad news for the consumer.

I just checked the I have about a 1/4 of a pint bottle left with a 2012 date on the label. I had bought another one last year, but given the new ingredients and info from Hoppe's I don't think I'll be doing my standard practice of leaving it in for long term storage after my old stuff is used up. I'll just do a barrel cleaning and use one of the protectant options. Esp. with what appear to be new carcinogens in the new formula (or at least the new MSDS sure is reporting more carcinogens, could be reporting requirements).

Many years ago I used to clean with wipe out, patch dry, and use Rust Barrier as a final patch for storage. However I liked Frank's method I'd add in Rem 40x sometimes, making sure to get all that out and then leaving Hoppe's in long term so it would continue to clean and protect, and dry patching before a range trip. This new formula though it looks like I'll go back to using more of a protectant only in the barrel for long term.
Sounds like a good plan. If not sure if your solvent has a protectant or not just dry patch it when done with the solvent then run a light patch of mineral/paraffin/hoppe's/etc. oil down the bore then dry patch before shooting.
 
Yep companies got away with and are still getting away with tons of stuff now pretty much blame free because they convinced the world it was all covid's fault. Consumers as a whole just learned to accept and take high prices and poor QC/service and it's become the new standard. Don't get me wrong covid legitimately messed up a ton of industries for awhile, but it also gave a ton of companies a blame free path to reduce staff, cut corners, shrinkflate, and increase prices blame free. You won't find another 5 years in history that the S&P increased almost 3000 points, even if you don't count the initial covid drop 1000 point drop (it only took 8 months to recover that) it's still increased 2000+ points from pre-covid. Companies convinced the world they were the victim and down on their luck, meanwhile making record profits and their stock prices show it and in almost every case it's bad news for the consumer.

I just checked the I have about a 1/4 of a pint bottle left with a 2012 date on the label. I had bought another one last year, but given the new ingredients and info from Hoppe's I don't think I'll be doing my standard practice of leaving it in for long term storage after my old stuff is used up. I'll just do a barrel cleaning and use one of the protectant options. Esp. with what appear to be new carcinogens in the new formula (or at least the new MSDS sure is reporting more carcinogens, could be reporting requirements).

Many years ago I used to clean with wipe out, patch dry, and use Rust Barrier as a final patch for storage. However I liked Frank's method I'd add in Rem 40x sometimes, making sure to get all that out and then leaving Hoppe's in long term so it would continue to clean and protect, and dry patching before a range trip. This new formula though it looks like I'll go back to using more of a protectant only in the barrel for long term.
I run a small business. I have never shipped faster or provided better service. That was my reaction to covid.
 
You are the exception. not the rule. What business are you in? Would like to support it if it's something I already use/need/want.
My customers say that to me. I tell them that in my world, that’s like thanking the frig for being cold. That’s just how it should be. I have a code on how a biz should treat its customer.

This is one reason I take such offense to the shenanigans I see in the gun industry. Why I go on and on about great American companies like Vortex and Seekins.

I have gone more and more incognito with my political/ gun stuff these days because of the viscous leftists and their “deep state”government. I can tell you that I’m in the motorcycle industry, 23 years now. Feel free to PM me for details.
 
@Frank Green
Update:
I quit using the thoroclean for the last 2 cleaning and I clean every 100 rounds and make sure there is no carbon ring.
My barrel sped up to normal velocities
78.4grs og H1000 was 2880ish fps now its 2933fps with no pressure sign whatsoever.
Moral of the story: I suggest everyone not to get fooled with all those ads they see about best barrel cleaner.
I will stick to my boretech cleaners like old days.
Cheers
Max
 
I tested both Chameleon gel and JBs & Kroil on a .375 CT HTI barrel and found that the JBs & Kroil combination works much better & faster.
That's what I use it when I do use abrasives. I'm finding that if I stay on top of cleaning after a range session (and no, I don't really like cleaning guns...but, its a necessary chore) then I don't find myself using the abrasives very often at all.
 
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Just use a blow torch and burn it out…..
Dude...you are an embarrassment to our former military service. Army has blow torches (yeah, they call them "flame throwers" but its a fucking torch...a J-79 in afterburner....now that's a flame thrower).

USAF uses napalm. So, get your head straight, Sgt. lol

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Dude...you are an embarrassment to our former military service. Army has blow torches (yeah, they call them "flame throwers" but its a fucking torch...a J-79 in afterburner....now that's a flame thrower).

USAF uses napalm. So, get your head straight, Sgt. lol

View attachment 8610847
Instead of frog lube we are going to end up with fougasse bore cleaner

 
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Hey @Frank Green I did a search and couldn’t come up with an answer given by you on how you clean a rimfire barrel.

With CF I just use your method and it works. Don’t know if rimfire is any different.

Second question: after using your CF cleaning process on a CF gun (or rimfire, I suppose), what do you think of not dry patching the bore before shooting? I guess there would be a bit of Hoppes in there.

I’ve read that the first bullet hydraulically pushing the liquid out is either bad, or not bad. Or that the heat/gas/pressure preceding the bullet pushes/evaporates/burns the liquid out before the bullet passes over it. Typical internet conjecture. I have no idea.

For people not named Frank Green (who already knows), gas apparently does exit before the bullet, btw. This vid shows slo-mo footage of a bunch of calibers exiting the bore. Don’t think they actually chrono’ed the bullets, but as a 204 lover, my totally unbiased analysis concludes that the 204 exit was the coolest 😎


I did see you do this before shooting:
 
I’d still shoot the bore dry before shooting. Especially the chamber. If the bore has oil/solvent in it…. Guaranteed fliers on the first rounds down it.
If I, uh, am willing to waste some cash with a flyer, do you think there’s any damage to the bore if not dry patching? Not that I’d ever do that lol

I’m not talking about slathering the bore with sticky oil or something. Just that light coat/one pass of Hoppes.

Might be sorta impossible to know.
 
I've read that one of the big reasons you don't want a lot of oil/solvent left on say an AR-15 bolt, or DI piston is that it ends up turning to heavy carbon deposits during firing. I wonder if the same would be true in the chamber/barrel if you left it wet with a solvent/oil.

I suppose it depends on exactly what is left in a barrel when left wet with hoppe's or whatever you are using etc. Not sure how much say #9 really leaves behind over time if you say wet patch and don't dry patch.

I'll admit I try to remember to dry patch, but there's been days I've gotten to the range and forgot to do it. I feel like that's the biggest "drawback" to me for leaving a barrel wet with oil/#9 etc. in storage, I can easily forget to dry patch it while loading up.
 
I know I've done it multiple times with AR's. Stored muzzle down, lube migrates, I typically forget to swab out and the first couple of rounds will be slick with excess, never an issue. Yes, you should have a bore, chamber and bolt face free of fluids. On an AR15, you want lube on the lugs, body, cam pin path, gas rings and bolt exterior at contact points.
On the bolt guns I'm typically using Bore Tech, dry the bore from that, a couple passes with a CLP and patch it out. That possibly leaves a small amount, never had an issue other than maybe a slightly lower velocity on the first and second round. More of a bore condition and not a safety problem. I haven't done it but some may run a patch of alcohol, etc. prior to firing?

I do know that on the one V22, I have a very small spot on the bolt, not the cartridge face, the bolt face from Rimfire Blend. I patched it out but apparently not enough, at that frame my practice didn't include the clp patch and I guess the water base formula caused this.
 
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If I, uh, am willing to waste some cash with a flyer, do you think there’s any damage to the bore if not dry patching? Not that I’d ever do that lol

I’m not talking about slathering the bore with sticky oil or something. Just that light coat/one pass of Hoppes.

Might be sorta impossible to know.

Don’t leave pools of fluids in your bore just as a good practice. That light patch gets squeezed and excess is wrung out when it enters the throat with a proper tight fitting patch so that can leave some pools on the other side of the bore guide.
Let it sit too long as as it dries up it can turn to a goo. Run an oil patch and then patch out, it will leave a bit of a shine still (which may actually be all you were alluding to) for a lil protection that won’t hurt beyond the first shot being 60fps different but it also means you don’t have that hydraulic worry nagging at the back of mind.
Edited for clarity
 
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so that can leave some pools in the otherwise of the bore guide.
“otherwise of the bore guide”?

Run an oil patch and then patch out, it will leave a bit of a shine still (which may actually be all you were alluding to)
Yeah, only instead of oil it’s Hoppes #9. And I don’t patch it out lol. There’s barely anything in there, liquid-wise…for example, I have ran a dry patch or two afterwards, and the patches are barely wet, and not even fully wet. Like the middle bit is dry.

Anyway, sounds like people aren’t turning their barrels into open bananas doing that sort of thing. I think.
 
I’d still shoot the bore dry before shooting. Especially the chamber. If the bore has oil/solvent in it…. Guaranteed fliers on the first rounds down it.
Oh, what about your rimfire guns? Do you use your same cleaning regimen? Including occasional use of blue JB or 40x etc.

Rimfire folks seem to subscribe to even more voodoo-like cleaning practices than CF shooters do 🧟‍♀️🪡
 
In my experience, a bronze brush and BT C4 or Rimfire Blend will get a rimfire barrel back to new condition with far less effort than a centerfire. Verified with a bore scope.

If you follow the shooter from Vudoo’s routine of soaking the chamber area with a wet patch to control the carbon ring, followed by one wet patch down the barrel and a few dry patches to dry the bore out. After a couple thousand rounds, it will take some brushing to get the bore spotless again. Start with a nylon brush to get the heavy crud out before transitioning to a bronze brush. Starting out with a tight fitting bronze brush is a chore to get down a bore with that many rounds on it.

Personally, cleaning after every range trip versus the other method produced similar accuracy, but it takes more foulers on a clean bore to get it to tighten up versus 2 foulers on a dirty bore.
 
Hey @Frank Green I did a search and couldn’t come up with an answer given by you on how you clean a rimfire barrel.

With CF I just use your method and it works. Don’t know if rimfire is any different.

Second question: after using your CF cleaning process on a CF gun (or rimfire, I suppose), what do you think of not dry patching the bore before shooting? I guess there would be a bit of Hoppes in there.

I’ve read that the first bullet hydraulically pushing the liquid out is either bad, or not bad. Or that the heat/gas/pressure preceding the bullet pushes/evaporates/burns the liquid out before the bullet passes over it. Typical internet conjecture. I have no idea.

For people not named Frank Green (who already knows), gas apparently does exit before the bullet, btw. This vid shows slo-mo footage of a bunch of calibers exiting the bore. Don’t think they actually chrono’ed the bullets, but as a 204 lover, my totally unbiased analysis concludes that the 204 exit was the coolest 😎


I did see you do this before shooting:

Not sure if this is of interest to you, but I've given this doc to some rimfire folks I know and they liked it very much.
 

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  • Rimfire Cleaning - Steve Boetler.pdf
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@Frank Green Id like to expand on this a bit and get your opinion on cleaning firearms other than precision rifles.

Milsurp rifles: I have some older mausers, 1903a3 springfield etc. Do you try to find bore guides for these, or just clean from the back and do your best?

AR Rifles: Do you use a bore guide for non precision/government type AR rifles? Any problems using hoppes in chrome lined barrels?

Other Firearms: Specifically ones that can't be cleaned from the back (revolvers, m1 garand, etc), do you use a muzzle guide on the rod?
 
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@Frank Green Id like to expand on this a bit and get your opinion on cleaning firearms other than precision rifles.

Milsurp rifles: I have some older mausers, 1903a3 springfield etc. Do you try to find bore guides for these, or just clean from the back and do your best?

AR Rifles: Do you use a bore guide for non precision/government type AR rifles? Any problems using hoppes in chrome lined barrels?

Other Firearms: Specifically ones that can't be cleaned from the back (revolvers, m1 garand, etc), do you use a muzzle guide on the rod?
For AR’s in a pinch you can use a bolt carrier as a bore guide.
 
@Frank Green Id like to expand on this a bit and get your opinion on cleaning firearms other than precision rifles.

Milsurp rifles: I have some older mausers, 1903a3 springfield etc. Do you try to find bore guides for these, or just clean from the back and do your best?

AR Rifles: Do you use a bore guide for non precision/government type AR rifles? Any problems using hoppes in chrome lined barrels?

Other Firearms: Specifically ones that can't be cleaned from the back (revolvers, m1 garand, etc), do you use a muzzle guide on the rod?
Nope I use a bore/rod guide for my AR rifles as well. Same with a 1917 enfield or Springfield or Mauser etc...

Use something. Something is better than nothing. If the barrel is in good shape... why take a chance on wrecking it?

The Sinclair rod guide is pretty universal. Only thing I've done to those is put a chamfer on the backside of the guide handle so it's easier to pull out as the ejector isn't locked against that flat surface.


or get a straight one piece one like this.....than it keeps the ejector pushed back the whole time and doesn't get hung up.


Later, Frank
 
@Frank Green

Wanted your opinion on ParkerHale jags from Dewey. I started using them and like them but the little voice in my head is telling me I am fucking up… Am I?
Why do you think you are fucking up....Frank has said many times he uses them...particularly when discussing use of mild abrasives like 40X and JB blue label.

Based on that I bought some of these jags and do indeed use them on the infrequent cleaning with abrasives that I do. No problem at all. I do use what would be considered an "oversized" patch if used with a pointed tip jag when using the Parker Hale type jags....e.g. 30 cal patch in 6.5 bore.

Cheers
 
@Frank Green

Wanted your opinion on ParkerHale jags from Dewey. I started using them and like them but the little voice in my head is telling me I am fucking up… Am I?
Obviously you cover up the entirety of the Parker Hale jag so the ridges don’t touch the bore. Just stating the obvious; I have been known to miss the obvious lol.

I take a large square patch and cut it to length so there’s a bit of overhang on the front so the patch can’t fold back when first inserting. You’ll have to experiment on how much overlap (the width) is needed to get a decent fit. I write it down so I don’t have to futz each time.
 
@Frank Green

Wanted your opinion on ParkerHale jags from Dewey. I started using them and like them but the little voice in my head is telling me I am fucking up… Am I?
That's pretty much all I use... the PH jags. I use the female threaded jags to thread directly on to the male threaded end of the rod. That way you don't need an adapter. I'll use the adapter if I have to but prefer not to.

Wrap the patch around the PH jab like you roll a cigarette. For 30cal I use a 2.25" square patch. For a 6.5mm about a 1.75" square is perfect.

Cut your patches to a proper size so they don't fit really tight and don't fit to loose. Cover the diamond pattern of the jag... you don't want the patch going onto the smooth surface where it threads onto the rod... that will create a tight/binding spot.
 
That's pretty much all I use... the PH jags. I use the female threaded jags to thread directly on to the male threaded end of the rod. That way you don't need an adapter. I'll use the adapter if I have to but prefer not to.

Wrap the patch around the PH jab like you roll a cigarette. For 30cal I use a 2.25" square patch. For a 6.5mm about a 1.75" square is perfect.

Cut your patches to a proper size so they don't fit really tight and don't fit to loose. Cover the diamond pattern of the jag... you don't want the patch going onto the smooth surface where it threads onto the rod... that will create a tight/binding spot.
Frank, do you see any reason why a properly sized bore mop smeared with some JB blue connected to a short carbon fiber cleaning rod for the neck/ throat area in lieu of of a patch on a PH jag wouldn’t work ?
 
I use the female threaded jags to thread directly on to the male threaded end of the rod. That way you don't need an adapter. I'll use the adapter if I have to but prefer not to.
fyi, a PSA for people that use Pro Shot rods with 8-32 female threads:
Pro Shot makes what they call a Brass Wrap & Spear Tip Jag, which is their version of the Parker Hale. It has male 8-32 threads.

 
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Hey, by the way I’ve been looking with no luck for a long time for a Parker Hale type jag for 20 and 17 cals.

Well well well I think I might’ve found something suitable, if not exact. Montana Xtreme makes these for 17/20cals (and more, of course):
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Now I have to see if I need to buy a new rod, or if the diameter is the same as the pro shot jags.
 
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Hey, by the way I’ve been looking with no luck for a long time for a Parker Hale type jag for 20 and 17 cals.

Well well well I think I might’ve found something suitable, if not exact. Montana Xtreme makes these for 17/20cals (and more, of course):
View attachment 8669737


Now I have to see if I need to buy a new rod, or if the diameter is the same as the pro shot jags.
Here’s the dimensions of the 17/20 cal jags. MX uses the same rod for both caliber, so the rod/jag transition diameter for both is 0.158”.

For Pro Shot, the 17cal rod is 0.155”, and the 20cal is 0.186”/0.187” -ish, so I guess I’d be using the 17 cal PS rod for both calibers with that MX jag.

Since I wouldn’t be pushing it out the bore, having a smooth transition isn’t as important (I think), so I’ll order some jags. If need be, I can sand the jag transition bit down or order their rod for this infrequent task.
 

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  • Montana Xtreme 17_ 20 cal jag dimensions.pdf
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@Frank Green

Wanted your opinion on ParkerHale jags from Dewey. I started using them and like them but the little voice in my head is telling me I am fucking up… Am I?

Nope many of us use them ,using them properly is another matter altogether .

Bore guide , Dewey Rods Chamber too Muzzle . Nylon brush with solvent ,when it pops out the end remove brush . I also use jags later and remove Jag and patch ,I also have several soft Uxcell / Sherwood hi temp silicone tube caps in assorted diameters . I then slip one on the end of the Rod thread as a protector . I then pull the Rod back and repeat . I even made various brass thread adapters to fit male Dewey thread M/F 8-36 / 5-40 and 8-32 and a larger 27 Cal. Rod with 12-28 I believe .
Anyway crap goes one direction OUT and drawing rod back protects bore from rod thread .

IF You don't want to bother removing Jag , you can purchase plastic thread screw inserts ,things you drill a hole in your wall tap in plastic insert and put a screw into . Just buy the un-flanged and those come in a few sizes also . Screw your Jag into one end ,pull the Rod back ,does same thing .

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My brain has never liked the idea of the parker hale type jags in that since the patch does not wrap evenly around it that it could over-pressure an area with less patch, but I've heard they are more picky about patch material/size too so that might be part of my experience. Same for the montana xtreme version where you puncture at a corner, usually if I do that, I can't use enough patch to cover the whole jag or it's too tight and seems like risking as the patch leaves the barrel pushing exposed jag into the crown. Ridiculous I'm sure, but even Montana's own video on how to use their jags shows an example where they only cover about 1/2 the jag with a patch and the rest of the exposed jag ridges side over the crown edge.

I tend to like the bore tech proof positive jags the patch evenly covers all of the jag that can touch the barrel. I really like the o-ring versions for a squeaky final clean, but they can be hard to find the right size patch/jag. You can run 2-3 patches with a normal snug jag/patch that are clean, but run a snug o-ring version after them and it will always pull out more stuff. I assume because it does a much better job getting into the corners where the lands/grooves meet.

Great ideas on the plastic anchors and/or end caps as well.
 
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Ok ok, so why no brush in and out? I used to be a one way only pass kind of guy and unscrew the brush after it exists muzzle and so on. However, after watching people like Erik Cortina run his in an out at 100mph, I don’t see why it’s a big deal? Thoughts? I always thought it was a little silly because it’s barrel steel and it’s hard for me to believe that a nylon brush with a brass collar coming out or riding back over the muzzle is going to do anything. Brass is much softer than barrel steel. I mean it flings copper jacketed lead out of it as thousands of feet per second. Is coming backwards over the muzzle really going to do anything?
 
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Ok ok, so why no brush in and out? I used to be a one way only pass kind of guy and unscrew the brush after it exists muzzle and so on. However, after watching people like Erik Cortina run his in an out at 100mph, I don’t see why it’s a big deal? Thoughts? I always thought it was a little silly because it’s barrel steel and it’s hard for me to believe that a nylon brush with a brass collar coming out or riding back over the muzzle is going to do anything. Brass is much softer than barrel steel. I mean it flings copper jacketed lead out of it as thousands of feet per second. Is coming backwards over the muzzle really going to do anything?
I too have done the same....used to remove the brush at the muzzle, pull the rod, reattached the brush, rinse and repeat and concluded it was a total fucking waste of time.

I use nylon brushes and see zero impact to the crown or anything else.

And...I haven't seen Cortina do it....but I've seen Speedy run that rod back and forth like he was stroking his meat. lol