Realistically Best Option for a 7.62 Gas Gun

DD907

Private
Minuteman
May 19, 2020
4
1
Alaska
I am in the market for a 7.62 gas gun. I want something that can own 0-700m with respectable accuracy, while also being extremely reliable. I want it to accept clip on devices as well, and have spare parts available to purchase. I am not partial to it using AR10 pattern mags.

My first choice would be an SR25 as I’ve owned one in the past and it was exceptional. But the cult following makes them impossible to find except for outrageous price gougers, and spare parts are impossible as well.

I’m also looking towards the LMT MARS-H, OBR, SP10, and MR762. I already own a 12in Assaulter MR762 so mags aren’t a deal breaker. If there are any other possible platforms that are recommended I would love to hear them.

I’m looking for input from guys who have experience with these platforms, like what kind of accuracy you get out of them. Thanks gents.
 
Last edited:
I am in the market for a 7.62 gas gun. I want something that can own 0-700m with respectable accuracy, while also being extremely reliable. I want it to accept clip on devices as well, and have spare parts available to purchase. I am not partial to it using AR10 pattern mags.

My first choice would be an SR25 as I’ve owned one in the past and it was exceptional. But the cult following makes them impossible to find except for outrageous price gougers, and spare parts are impossible as well.

I’m also looking towards the LMT MARS-H, OBR, SP10, and MR762. I already own a 12in Assaulter MR762 so mags aren’t a deal breaker. If there are any other possible platforms that are recommended I would love to hear them.

I’m looking for input from guys who have experience with these platforms, like what kind of accuracy you get out of them. Thanks gents.
Cough/ Geissele GRF 6 ARC /Cough

If you are set on 308 I would without question do the LMT. You are effectively buying multiple gas guns because of the swappable barrel systems.
 
  • Like
Reactions: Jsp556 and MSTN
I am in the market for a 7.62 gas gun. I want something that can own 0-700m with respectable accuracy, while also being extremely reliable. I want it to accept clip on devices as well, and have spare parts available to purchase. I am not partial to it using AR10 pattern mags.

My first choice would be an SR25 as I’ve owned one in the past and it was exceptional. But the cult following makes them impossible to find except for outrageous price gougers, and spare parts are impossible as well.

I’m also looking towards the LMT MARS-H, OBR, SP10, and MR762. I already own a 12in Assaulter MR762 so mags aren’t a deal breaker. If there are any other possible platforms that are recommended I would love to hear them.

I’m looking for input from guys who have experience with these platforms, like what kind of accuracy you get out of them. Thanks gents.

Go to Gunmagwarehouse and look under:
Rifle mags
Filter by brand
Ruger
Look for their SR7.62 mags
$15.99

These are factory duramags and have worked great in my AR 10.
 
A series Armalites should be on your list. Parts are available. They hold they’re own against any other large frame I’ve shot. If you’re good with proprietary mags, B series guns should be considered as well. Gen2 Armalite mags should last forever and can still be found new in the wrapper in the $35 range.
 
A series Armalites should be on your list. Parts are available. They hold they’re own against any other large frame I’ve shot. If you’re good with proprietary mags, B series guns should be considered as well. Gen2 Armalite mags should last forever and can still be found new in the wrapper in the $35 range.
I was watching smallarmsolutions and they were talking about Armalite since the early 2000s has/had been contracting out the production of the majority of their rifle parts to Aero .
 
At one time aero made armalite receivers as far as I know most of their stuff is made in Texas at some huge factory place that OEMs all sorts of things.

edit: they are building a larger facility in Bryan, TX as well:

"Per the 10-year agreement, Phase I construction must start within 18 months after all parties have signed the agreement and be substantially completed within 12 months. Phase II (BASE Armalite) construction must commence within 24 months after Phase I is completed and be substantially completed within 18 months. After five years of operations, SAC will maintain 70 full-time jobs with an average salary of at least $55,000."
 
Last edited:
I was watching smallarmsolutions and they were talking about Armalite since the early 2000s has/had been contracting out the production of the majority of their rifle parts to Aero .
F8288179-0EE7-43A8-B90B-F970ADE22C23.jpeg


I have a factory 24” T model, rebarreled it with one of the new 20” Super Sass barrels, a new TAC18, and shot several other A and B models with chrome lined, stainless, and melonited stainless barrels. Their barrels shoot. The guns run reliably both suppressed and unsuppressed. I’ve never picked up a large frame Armalite gun that had sloppy reciever fit. Factory and aftermarket parts are available. Gen 2 Armalite B series mags are as good as any and better than most SR25 pattern mags.

I’ve never shot an Aero barrel that shoots as well. Aero large frame recievers don’t fit as well. Aero BCGs aren’t as good. Aero may make some things for Armalite, but I’m not sure why you’d make contract parts better than the ones that carry your own name.
 
but I’m not sure why you’d make contract parts better than the ones that carry your own name.
It’s all in the contract specifications. If the contract calls for a better product, the contract pays for a better product, and you can make a better product; you make a better product. Aero knows what they can sell Aero branded parts for, and the “quality” necessary to both sell them and make a profit on them. The calculus may well be different for other lower roll marks…

In another industry… Back when US knife brands were made in the USA, Case made Camillus branded knives, while Camillus made Case branded knives, all the while they were both making knives with their own branding as well.

Manufacturing ie weird and doesn’t always “make sense” from the outside looking in.

That said, I don’t know anything about who makes Armalite rifles.
 
Aero used to make parts for almost everyone before branching out on their own. Similar to CMT ( stag). Aero is low/mid grade shit at best and is commodity AR products.

Op. I would reccomend moving to 6.5 or 6 creed if staying in a large frame AR. Both have significant first round impact probabilities over 308, while being cheaper, better ammo options and less recoil. This means they are easier to shoot.

If you are dead set on .308...the seekins sp10 is kinda the king option now. I've owned and built them all over the last 20+ years and pound for pound and dollar for dollar the seekins kicks the shit out of everything else. I would put it up against guns costing twice as much...( which I own by the way) and not think twice. It has the second best handgaurd interface after the monolithic LMT...but lmt has its own set of issues I would steer clear from.

If you want to go small frame...the 6 arc in something like a Geiselle GFR 20" is king dong right now. Phased gas array and barrels that are absolute hammers. You can get factory match ammo for $1/rd as well and it's a very forgiving round that is cheap and easy to reload for. Inside 700 yards the 6 arc is a clear winner unless you need to shoot a moose or elk.
 
I have an Armalight SuperSASS that uses the M14 style magazines. It reliably shoots around 3/4 moa with 168FGGM and around 1 moa with 175 FGGM. I've been very happy with it for what I paid for it. Trigger is great, and the suppressed-vs-unsuppresed switchable gasblock has worked really well.

The SuperSASS was Armalights submission for the M110 program I believe. What I heard somewhere is that Armalight was performing well but pulled out becasue it became apparent that Knights would win the contract due to already making the SR25. While I've never owned a KAC I can't see what exactly I gave up to keep another $6-8000 in my wallet.
 
There’s TWO Seekins SP10’s for sale in the PX currently. Just swap for a .308 barrel or shoot the 6.5CM that’s on it for your purpose. I can attest that if you need parts, Seekins will get them out asap to you. They’re hard to get ahold of until you actually do business with them and get private extensions and/or emails to specific sales persons. Then they really take care of you. 🍻
 
  • Like
Reactions: Jwright74
LMT MWS with the SLK/SL8 rail (unless you cut down the MLOK bolts so you don’t have to pull accessories off when you remove the barrel).

LMT’s stainless match barrels are friggin lasers. Plus the monolithic rail will benefit you with the clip ons. …and pulling the barrel for a swap or deep clean is a 30 second job (unless you have mlok attachments haha).

MARS-H is nice but a lot of places will give you a screamin deal if you get the standard MWS lower. So if ambi doesn’t matter to you as much as saving some cash for ammo/other barrels, then I’d consider that.

I’ve had an old school OBR and MWS MARS-H as well as issued KAC SR25/MK11’s and if I’m buying with my cash, I’m buying LMT.

-A guy who’s opinion is worth less than you paid for it.
 
Man, I agree with the price being high, but I think that there's sufficient evidence that the SR-25 APC is at least a pretty decent option for large-frame semi-auto rifles.
Yea no doubt about that Jack. I don't know if you can tell from my posts but I have been a KAC whore for almost 25 years.

I would much rather have an APR when pushing that distance with a .308. Im not the biggest fan of 16" large frames, and with the prevalence of newer small frame cartridges that are bridging the gap (6 arc for example), along with rounds like the 6 and 6.5 creed that IMO make the .308 an obsolete round for new purchases. Energy on target aside, first round impacts taking into account ease of shooting platform is what I am focusing on.

I have a special place in my heart for Knights and their contribution to the development of the small and large frame AR, along with various interfaces cannot be understated. But the pricing and availability has gotten ridiculous in the last 5-8 years. What was a solid 4-4.5K gun is now 6K. I get it there is inflation and gov procurement to contend with, but there are so many good modern competitors that are about 1/2 to 2/3 the price that I just can't justify dropping 6K on a an AR in an obsolete caliber. You can grab 2 Seekins SP10s for the less than a SR25, I would put them up to them head to head. The last couple SR15s I bought were 15-1800. Now they are twice that, and thats before the secondary market rape. For the old KAC price you can pick up a brand new Super Duty that other than the gas system and E3, compares very favorably, with arguably better trigger and rail system. And you can buy both of those guns all day. My last KAC backorder took almsot 3 years to fill (and yes I am on backorder lists for alot of other stuff). I can afford to pay retail prices for the stuff I want, but many can't justify it when comparing.

Not trying to turn this into a KAC bash, but this is what alot of the market is thinking, especially guys who have been in this game for a long time. I get that KAC doesn't really give a shit about commercial sales but when you see the KAC compound it makes you wonder how they cannot make enough premium boutique (which is what they are) guns to satisfy demand. It has to be one of if not the largest firearms manufacturing facility in North America. The low supply has made the secondary market insane.

Its like Pappy Van Winkle. $120 retail price. Worth every penny. Might even be willing to pay a little more. Secondary market is $1500-2200. Abosolutley insane due to scarcity and marketing. Even if I can afford it, I can get similar or better products for a fraction of the price today.
 
My SP10 in 6.5CM is a laser. I have no issues shooting 1/2-3/4 MOA with my handloads. The barrel does seem to get a small amount of copper fouling but it hasn't affected accuracy.

Watching that video, I have no idea how they get that kind of horrible accuracy out of the SP10 or several other guns.
 
Just dropped in the PX. This is the one.
 
I am a fan of LMT if thinking 308. Even their 16" chrome lined barrels are surprisingly accurate. In fact I have had better accuracy from MWS's than LMT's standard AR's.

I have built a few large frame AR's, including ones with a custom McGowen barrel as well as a stainless Criterion barrel, and it equals the accuracy of all of them despite being a factory gun with a stock 16" barrel.

Now I am sure a Seekins or GAP are also great but I have no experience with them. They are probably a better choice if going 6.5 CM.
 
LMT makes a good gun but there are some drawbacks. Proprietary barrel extension means you are limited in getting barrels spun up. Availability is all over the place. They are supremely overgassed, so something needs to be done about that gas system, especially if you plan to suppress them. I have had a few over the years and its one of the only premium large frame AR's you can just piece together buy buying all the parts separate. Then there is the dumb ass 140 in lbs spec which is unheard of with torque limiters.
 
  • Like
Reactions: HD1911
My SP10 in 6.5CM is a laser. I have no issues shooting 1/2-3/4 MOA with my handloads. The barrel does seem to get a small amount of copper fouling but it hasn't affected accuracy.

Watching that video, I have no idea how they get that kind of horrible accuracy out of the SP10 or several other guns.
looking at them shooting the rifles and the way they speak about them tells me everything I needed to know. I stopped watching after the intro. Every seekins I have shot or seen be shot has been an absolute hammer and very pleasant to shoot with or without a can.
 
Yea no doubt about that Jack. I don't know if you can tell from my posts but I have been a KAC whore for almost 25 years.
That's what caught me a little by surprise, but the explanation of:
I would much rather have an APR when pushing that distance with a .308. Im not the biggest fan of 16" large frames, and with the prevalence of newer small frame cartridges that are bridging the gap (6 arc for example), along with rounds like the 6 and 6.5 creed that IMO make the .308 an obsolete round for new purchases. Energy on target aside, first round impacts taking into account ease of shooting platform is what I am focusing on.
Gives a pretty good context of why you said that. But I gotta say, inside 800 yards you're not really leaving much on the table from a practical performance standpoint between a 20" and a 16" .308. They're both not quite 4 MPH guns at 700 yards, and while the 16" (with about 100ft/s lower MV) will require a little more elevation at 700, it's still significant enough of a drop even for the 20" that you can't get away with just winging it anyway. I came in 2nd in the 2017 PRS Gas Gun Series in Tactical Heavy with a suppressed 16" APC shooting 168gr FGMM primarily against folks with 20-24" barrels. I won't say that the 16" gun was a ballistic match of those other guns, and I had to work a little harder in some areas, but there were also advantages in mobility. Now, that said, I would ABSOLUTELY prefer a 6.5 Creedmoor in ANY barrel length over a .308 if I have a choice.
I have a special place in my heart for Knights and their contribution to the development of the small and large frame AR, along with various interfaces cannot be understated. But the pricing and availability has gotten ridiculous in the last 5-8 years. What was a solid 4-4.5K gun is now 6K. I get it there is inflation and gov procurement to contend with, but there are so many good modern competitors that are about 1/2 to 2/3 the price that I just can't justify dropping 6K on a an AR in an obsolete caliber. You can grab 2 Seekins SP10s for the less than a SR25, I would put them up to them head to head. The last couple SR15s I bought were 15-1800. Now they are twice that, and thats before the secondary market rape. For the old KAC price you can pick up a brand new Super Duty that other than the gas system and E3, compares very favorably, with arguably better trigger and rail system. And you can buy both of those guns all day. My last KAC backorder took almsot 3 years to fill (and yes I am on backorder lists for alot of other stuff). I can afford to pay retail prices for the stuff I want, but many can't justify it when comparing.
I'm right there with you on the inflated secondary market. The world will be a better place when they move at MAP rather than 1K over MSRP.
Not trying to turn this into a KAC bash, but this is what alot of the market is thinking, especially guys who have been in this game for a long time. I get that KAC doesn't really give a shit about commercial sales but when you see the KAC compound it makes you wonder how they cannot make enough premium boutique (which is what they are) guns to satisfy demand. It has to be one of if not the largest firearms manufacturing facility in North America. The low supply has made the secondary market insane.
Yup, totally get it. Really it comes down to commitments and production capacity. We are still recovering from 2019/2020. Lots of factors that go into that, but running lean manufacturing requires a constant and consistent supply of raw material and needed purchased items, and when that gets disturbed it causes ripples that turn into tidal waves. Combine that with some contracts and government commitments and you rapidly find yourself in a position where you are between a rock and a hard place, and the rock is holding back a volcano.

I know that when I come in on something like this it is going to result in people wanting to share their opinions on how f**ked up the situation is. I know that I am going to take heat, but it's no secret that I'm a member here so if I see something being thrown out there I'm going to say something (unless it's already degenerated past a reasonable point). I apologize to any OP that has had their thread derailed due to my participation. I try to avoid continuous involvement unless the OP is directly interacting.

While we do indeed have a large shop and production capacity, we also have a broad product range we have to cover; from M4 RAS to PVS-30 components, Mk 11 gas blocks to KS-1 selector drums, and NT4 suppressors to LAMG systems. We hold somewhere around 700 active NSNs. I wish I could devote all production to the current and near-future product lines, but we are inevitably (and in many cases involuntarily) tied to legacy products that consume production capacity.
Its like Pappy Van Winkle. $120 retail price. Worth every penny. Might even be willing to pay a little more. Secondary market is $1500-2200. Abosolutley insane due to scarcity and marketing. Even if I can afford it, I can get similar or better products for a fraction of the price today.
I have made this exact comparison in many discussions. Diminishing returns is a reality, and when all factors of performance and weight are combined, it generally becomes understandable why the MAP price-point of SR-25s is where it is, but that does not mean that everyone is willing to part with that much money to own one (even before the crazy secondary market price). All comes down to what the customer wants.
 
Last edited:
Its like Pappy Van Winkle. $120 retail price. Worth every penny. Might even be willing to pay a little more. Secondary market is $1500-2200. Abosolutley insane due to scarcity and marketing. Even if I can afford it, I can get similar or better products for a fraction of the price today.
I want to start this off by stating that I am a Whiskey guy, in general I do not buy Bourbon.

My wife got put on the board of a public company that has a big office in Lafayette LA. As a new member, she went there to do a tour of the facility and this 20 something girl in their marketing department gave her the tour. It ended in the Presidents office and being Louisiana, of course it had a bar in it. My wife was looking and pointed at a bottle of something and said, "my husband really likes that."

About two weeks later this shows up at my front door.

Pappy.jpg


It turns out that the marketing girl is the grand daughter of the guy who owns Sazerac so she arranged for a welcome gift.
 
LMT makes a good gun but there are some drawbacks. Proprietary barrel extension means you are limited in getting barrels spun up. Availability is all over the place. They are supremely overgassed, so something needs to be done about that gas system, especially if you plan to suppress them. I have had a few over the years and its one of the only premium large frame AR's you can just piece together buy buying all the parts separate. Then there is the dumb ass 140 in lbs spec which is unheard of with torque limiters.
Pics of brass taken today from my MARS-H, 16” SS barrel, SureFire SOCOM suppressor.
100% factory configuration, 100% reliable.
All brass landed 10-15 feet from the gun.
Not overgassed.
 

Attachments

  • IMG_2024-07-31-144305.jpg
    IMG_2024-07-31-144305.jpg
    235.6 KB · Views: 75
  • IMG_2024-07-31-144445.jpg
    IMG_2024-07-31-144445.jpg
    230.2 KB · Views: 78
Shoot one next to an SR25 and you will learn the difference between a properly gassed rifle and one thats over gassed. Most of the guns you see today have the benefit of KAC R&D in their blood. So much of this platform is derived from things KAC figured out way before anyone else, and incorporated into their platforms. Things like the Ambi lower and the Free float rail system that evolved from the steel and carbon systems of the 80s and 90s.

There are different ways to make a rifle "reliable" in adverse conditions. One is to gas the piss out of it, like most commercial AR guns. KAC was the first that really figured out the gas system and made improvements to it with the SR15 MOD 0, which evolved over time into the mod 1 and mod 2. Same tech was incorporated into their SR25's, which made them very soft shooting. Part of this common overgassing is due to widespead use of weaker than mil spec (M193/M855) loads and the other is due to getting a bunch of random parts to work together when they arent designed/machined/assembled/QC like premium guns were.

LMT has always been a military/contract centric company. They were one of the true builders of mil spec guns back in the day and were a supplier to the US gov and DOD. They even did some manufacturing for KAC and visa versa as I understand it. So while KAC was in the same boat , they pursued the route of improvements to the platform vs redesign of it via molithic and branching to piston guns. They need their guns to work in the worse conditions, so they overgas them to ensure they do.

Its common knowledge LMT guns are so over gassed there is a boutique industry making custom gas tubes to fix the issue. Add a can, it gets that much worse.

Now most mid to higher end guns today are built much better than the past, with all those years of knowledge and experience baked in. I think the delta between KAC and the rest has gotten much smaller and there is more comparable compeition today, but we wouldnt be here without KAC.

I have been buying mostly Geisselle stuff the last couple years, and Bill is a huge supporter of our sport and I can't tell you how many thousands in gear I have got from his donations to matches. Even if he didn't, I would spend the money on his stuff. His rail systems, triggers and now barrels, are among the best money can buy.
 
I have an Armalight SuperSASS that uses the M14 style magazines. It reliably shoots around 3/4 moa with 168FGGM and around 1 moa with 175 FGGM. I've been very happy with it for what I paid for it. Trigger is great, and the suppressed-vs-unsuppresed switchable gasblock has worked really well.

The SuperSASS was Armalights submission for the M110 program I believe. What I heard somewhere is that Armalight was performing well but pulled out becasue it became apparent that Knights would win the contract due to already making the SR25. While I've never owned a KAC I can't see what exactly I gave up to keep another $6-8000 in my wallet.
I also had the original supersass 24in with the modified M14 mag and it shot absolutely amazing with the lighter weight bullets, even my 110 vmax handloads. It was a pure precision build and unfortunately too ahead of its time for the market because they went with the M14 style mags and a lot of customers expected them to run like a a HK91 or FAL and eat cheap nato surplus and complained that they were unreliable.

One of the very few rifles I regretted selling but found a used SR25 EMC 16in for a steal back before YouTube era of retarded KAC pricing. I even got the MAMS brake but didn’t end up using it on it (put it on my DTA 16in 308) since the original flash hider and recoil impulse was already quite good. I use 150 gold dot hand loads or factory fed fusion 150 with the KAC because it’s decently accurate, has a decent BC and velocity and will kill shit death at < 400 yards.
 
I used to be in the same boat looking for the best large frame for 700-1000 yards. I ended up going with a 14.5 and 20 inch Geissele gfr in 6 arc. 90-95% of the performance of the 6.5 creedmoor in a small frame was too much to pass up. Definitely something to think about if you aren’t hell bent on a large frame. If so get a KAC.
 
Shoot one next to an SR25 and you will learn the difference between a properly gassed rifle and one thats over gassed. Most of the guns you see today have the benefit of KAC R&D in their blood. So much of this platform is derived from things KAC figured out way before anyone else, and incorporated into their platforms. Things like the Ambi lower and the Free float rail system that evolved from the steel and carbon systems of the 80s and 90s.

There are different ways to make a rifle "reliable" in adverse conditions. One is to gas the piss out of it, like most commercial AR guns. KAC was the first that really figured out the gas system and made improvements to it with the SR15 MOD 0, which evolved over time into the mod 1 and mod 2. Same tech was incorporated into their SR25's, which made them very soft shooting. Part of this common overgassing is due to widespead use of weaker than mil spec (M193/M855) loads and the other is due to getting a bunch of random parts to work together when they arent designed/machined/assembled/QC like premium guns were.

LMT has always been a military/contract centric company. They were one of the true builders of mil spec guns back in the day and were a supplier to the US gov and DOD. They even did some manufacturing for KAC and visa versa as I understand it. So while KAC was in the same boat , they pursued the route of improvements to the platform vs redesign of it via molithic and branching to piston guns. They need their guns to work in the worse conditions, so they overgas them to ensure they do.

Its common knowledge LMT guns are so over gassed there is a boutique industry making custom gas tubes to fix the issue. Add a can, it gets that much worse.

Now most mid to higher end guns today are built much better than the past, with all those years of knowledge and experience baked in. I think the delta between KAC and the rest has gotten much smaller and there is more comparable compeition today, but we wouldnt be here without KAC.

I have been buying mostly Geisselle stuff the last couple years, and Bill is a huge supporter of our sport and I can't tell you how many thousands in gear I have got from his donations to matches. Even if he didn't, I would spend the money on his stuff. His rail systems, triggers and now barrels, are among the best money can buy.
With my LMT uppers, I have the 12" piston and shoot it with an RC3. My 6 ARC has the Riflespeed adjustable gas block, the 16" 5.56 DI is a mid. None of them are more noticeably gassy then any of my other rifles. Just because I used them both quite a bit, my 12" piston LMT is less gassy and has slightly less kick then my 11.5" KAC upper. This is not a dig at KAC, I actually think the difference is the LMT is a little over 2lbs heavier (quad pic and Eotech plus magnifier) vs the T2 on the KAC.

I also am really developing some love for Geissele. My 14.5 inch URG-I upper is absolutely nails. Everything about it is fantastic.
 
<----- APC // used to have an APR

In looking over @ 3 dozen targets.... 0.6 - 0.8 MOA is pretty common in my folder. APC is much handier - a little lighter, handles like a large carbine, barrel is heavy enough to pound rounds (not to the same extent as the APR), but again - still pretty handy for a pig. Rail on the APC is long enough for a PVS 30 and most larger optics, w/ beams on the side. 800 is fine for the 16" providing you're on top of your wind call. IMHO - the APC is perfect. You can use an LPVO and it is a great 'big carbine', or clamp some magnification on top and fling 'em far.

43.5 RE15 & Lapua or 42.2 4064 & LC + 175 SMKs

(Can not wait for the equivalent - K1 in 5.56)


I have no opinion on what you should spend your money on. Best of luck regardless.
 
Last edited:
The SP10 is a lot of rifle for the money. I'd go with one of those or a GAP-10 G2 if you can find one at a deal. I'm not sure if GAP does anything special to the Seekins upper but they use a Bartlein barrel.

Seekins also makes a 6ARC...
 
  • Like
Reactions: NHPiper and ut755ln
The SP10 is a lot of rifle for the money. I'd go with one of those or a GAP-10 G2 if you can find one at a deal. I'm not sure if GAP does anything special to the Seekins upper but they use a Bartlein barrel.

Seekins also makes a 6ARC...
My opinion is it’s not worth almost twice the price BUT it does bring a cool factor.
Seekins factory rifles are better than most shooters realistically. That being said, all mine are custom built how I want them from Seekins receivers. I’ve stated it before, they really take care of their customers and their shit is well made.