I am wondering if anyone has seen this kind of pitting in your barrel, and what causes it? Shooting a gas gun I just picked up and it's really not printing groups that well.
Gas gun barrel issues?
- Thread starter Sako man
- Start date
You are looking at a pic right after some KG polish, that's why it's so shiny. Getting very low MV as well.
You'll have to decide at which point your time is worth more than a new barrel. I'd shoot it and see if it settles. But if by 200-250 rounds it hasn't, time to buy it's replacement. JMO.
"Not printing groups that well"
Have you contacted the manufacturer/retailer for a potential warranty issue? Or is this an "as is" buy off the PX?
What ammo?
Russian steel case 55gr/plinking reloads vs Federal 69gr Gold Medal Match/finalized known accuracy load proven in multiple rifles.
What's the purpose of that rifle?
Fun/blasting vs. DMR/precision-ish.
If it doesn't measure up to the purpose standards you "need" it for, toss it and get another barrel, or relegate it to the "plinking rifle" category.
Have you contacted the manufacturer/retailer for a potential warranty issue? Or is this an "as is" buy off the PX?
What ammo?
Russian steel case 55gr/plinking reloads vs Federal 69gr Gold Medal Match/finalized known accuracy load proven in multiple rifles.
What's the purpose of that rifle?
Fun/blasting vs. DMR/precision-ish.
If it doesn't measure up to the purpose standards you "need" it for, toss it and get another barrel, or relegate it to the "plinking rifle" category.
I got it off the PX here. Seller said its a Bergara barrel. And it's on a mk12 clone. Seller said only 250 rounds through it. I put some 77 fgmm through it. No, this needs to be in precision land for me.
This isn't a casting
The odds that wrought bar stock would have that many inclusions are simply astronomically low.
99% sure those are corrosion pits. And before anyone says "but it's stainless", 416 will absolutely rust. Just not as quickly as carbon steels.
Yeah. Then definitely buy once/cry once with a White Oak Armory barrel or similar.
Needs to hold 1 MOA. Shooting 1.5 to 2 right now. And MV around 2500. Pretty low MV for an 18" barrel.
My 16" criterion barrel shoots the same ammo at 2790 and maintains under 1 MOA
I scrubbed it out with KG and going to re shoot it and see. It might just be shot and need a new barrel. Will find out.
You should send him one of your barrels then an let him try it out. You're manufacturing and sales should take way off. I;m sure there's no possible way all those pits exist in that steel. Even the pictures must be wrong. Nobody ever makes bad steel.
Right here. ^^^I am obviously not the metallurgist you are. I mean the pictures show pitted metal, but that can't possibly be the case because you've never seen it before and it's highly unlikely that it exists. But feel free to explain how 416 goes that south after 250 rounds. I'm all ears.
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Yeah that is super low for 77gr FGMM and if you have something to compare to it eliminates you. I can't offer any help on the barrel but I think you are right to be suspicious.
Re shot and Chronographed and same results. Barrel has seen better days. Who's to say how the pitting happened but either way its probably effecting both muzzle velocitie and accuracy.
I think it's odd. White oaks or Centrion will be superior at this stage.
I think it's odd. White oaks or Centrion will be superior at this stage.
Stainless will and does rust,the process can be helped along by using the improper (cheap steel) brush.
Or by leaving carbon in the barrel to absorb moisture and hold it up against the steel.
The throat was caked with carbon, easy clean. But once I got through it there is a lot of cracking in the stele. So yeah..... I wouldn't call it mag dumb, but rather higher than stated round count.
Yes, I shot freedom munitions 75gr and IMI 77 grain, all MV's are lower then in my other rifles.
Ordered a new barrel, at this point I don't have the time to chase things. But it kinda sucks as I don't believe this was as stated. I could totally be wrong but I really don't think so.
Bergara is not known for producing good ar barrels. Do you mk12 right and order a Douglas barrel from CLE or WOA
There's probably nothing wrong with it per se you are getting what you paid for. Muzzle velocity of 2600-2650 and 1-1.5MOA groups would be my guess?
If you want it to be "precision" then spend more money. White Oak are the cheapest ones that still perform fairly well MOA or better. Otherwise get a Douglas which is the spec.
How quickly does this carbon holding moisture and then damaging your barrel process take? The idea of having to DEEP clean my barrel down to the steel everytime I go to the range sounds awful. We talking a month, a year? Now you got me all worried over here lol
Too many variables to predict that. Are you storing them in a safe, inside a padded foam case, Florida humidity or Arizona desert, etc.
Simple preventative maintenance is to run a dry patch to remove loose carbon and then a wet oil patch down the barrel at the end of the range trip. Run a dry patch down the barrel before the start of one.
Simple preventative maintenance is to run a dry patch to remove loose carbon and then a wet oil patch down the barrel at the end of the range trip. Run a dry patch down the barrel before the start of one.
The accuracy is ok, 1.5 moa being smallest groups, most about 2 moa. I would like to get it to 1moa. But the MV is way too low, 2500... that's with FGMM, the other stuff I'm shooting is hovering around 2550. Doubt it would stay transonic for long.
I got a new barrel coming. PRI has been closed so looking for instructions to remove the hand guard.
What handguard? The carbon fiber tube thingy is a lock ring at one end you just unscrew it with a spanner wrench or strap wrench or whatever.
Looks like its still a lock ring design but with a diff barrel nut than I remember
www.precisionreflex.com
www.precisionreflex.com
Maybe there's a couple allens inside it for set screws or something but I bet it just unscrews.
Is that gas block pinned on? When I had one it was a clamp I think. If it's pinned you'll have to bonk those out too.
AR15-M16 Replacement Gen 2 Forearm Collar W/ Black Finish
Gen II AR15 Replacement forearm Collar with Black Finish
www.precisionreflex.com
AR15 - M16 Gen II Replacement Steel Barrel Nut
Gen II forearms replacement Barrel nut Steel
www.precisionreflex.com
Maybe there's a couple allens inside it for set screws or something but I bet it just unscrews.
Is that gas block pinned on? When I had one it was a clamp I think. If it's pinned you'll have to bonk those out too.
