6mm Arc Build Questions

[williamagee80]

Good morning everyone. I am looking at building a rifle in 6 ARC and I’m curious what part combinations people who have some time on their builds have had success with. Specifically I’m talking about barrel performance, gas system setup that has been functioning well and buffer tube setup. Thanks and I appreciate any insight!

 

[SalomonQST99]

I built a 6 ARC based around a 22" fluted Shaw barrel. The barrel uses a rifle length gas system with an SA adjustable gas block. Had a carbine length AR-15 buffer and I just tuned for proper brass ejection.

 

[Redlion]

I am interested in recommendations for a build as well.

 

[Ledzep]

I have a 16" build that I'm pretty happy with as a hunting/beater rifle,

Aero upper (no F/A but do whatever makes you happy)
Aero M4e1 lower
Aero handguard
Faxon Match 6mm ARC 16" barrel (YMMV, I think I got lucky with this one it hammers with factory ammo, I know Faxon doesn't always deliver in that regard). Pretty sure it's mid-length
Aero adjustable gas block
Geiselle trigger (3.5lb single stage), standard guts otherwise & magpul grip/stock
Vortex 1-10x razor
Ultra 5

 

[Dogtown]

I've done a 26" rifle +2 gas build, a 16" rifle gas build, and a 20" rifle gas build. All were easy to tune, but what I've learned about these barrels comes down to this:

• 16" is fine for the vast majority of setups and you can still shoot 100-110 class bullets at reasonable velocity
• 26" is too long and not the velocity increase you'd expect
• 20" feels like the sweet spot if you're trying to maximize mass/velocity

 

[stevieb92]

I went with a 20 inch X Caliber barrel (bull profile and rifle gas) on my Mega Arms AR-15 receiver set. Using a JP rifles full mass bcg, SLR Sentry 9 adjustable gas block, LaRue MBT-2S trigger and Vortex Viper PST Gen 1 4-16x50 mrad scope it easily printed sub moa groups with factory Hornady 108 ELD-M.

 

[WestTN2288]

I’m shooting an 18in ballistic advantage barrel, rifle length gas, sa gas block with a Toolcraft BCG. Extremely happy with it. Shooting 108s @2600.

 

[db2000]

Seekins. Geissele Super 42 braided spring, H2 (iirc) buffer, JP HP bolt (which comes headspaced and recommended by) Proof 18” +1 rifle, SA AGB. Almost exclusively suppressed. No issues, very accurate and good velocities.
As mentioned 18-20” is where this cartridge shines. I’ve had good luck with Duramag SS 6 ARC mags.

 

[ut755ln]

Good morning everyone. I am looking at building a rifle in 6 ARC and I’m curious what part combinations people who have some time on their builds have had success with. Specifically I’m talking about barrel performance, gas system setup that has been functioning well and buffer tube setup. Thanks and I appreciate any insight!

I converted a 5.56 LMT to a 6 ARC. I did the barrel swap with D Wilson and bought a Proof stainless barrel. I changed out the bolt face for the 6.5 from JP. I have tried a couple of mags but the only one that has worked flawlessly for me have been the Geissele.

 

[A&8's]

Odin 20”, rifle gas, Odin adjustable block, Anderson lower, TT diamond, JP Enterprise H2 SCS, LuthAR butt stock. “Built” in 2021

Edited to correct date.

 

[db2000]

Odin 20”, rifle gas, Odin adjustable block, Anderson lower, TT diamond, JP Enterprise H2 SCS, LuthAR butt stock. “Built” in 2016-ish


View attachment 8583445

Damn! You beat the DoD building a 6 ARC by like 4 years. And Lowlight will bust a nut when he sees the height on that scope! That’s the future apparently.

 

[A&8's]

Damn! You beat the DoD building a 6 ARC by like 4 years. And Lowlight will bust a nut when he sees the height on that scope! That’s the future apparently.

Well, I have no idea WTF I was thinking of when I said ‘16. Looking at my data book, it reads 5-30-21. lol.

The scope height fits my face comfortably. I’d rather be comfortable than super cool low.

 

[supercorndogs]

18" rifle+1. 22" rifle +2. 16" rifle length gas h2 and h3 buffers in a carbine tube with regular and flatwire springs shooting suppressed. Not problems getting any of them running and adjusted.

 

[Eric_F]

I'm also running a 18" rifle +1" gas. I think it's got an A5H1 buffer, and it's tuned for suppressed but absolutely will not work unsuppressed. I think the performance overlap would be a lot bigger for rifle gas if I was taking the can off a lot.

 

[db2000]

I'm also running a 18" rifle +1" gas. I think it's got an A5H1 buffer, and it's tuned for suppressed but absolutely will not work unsuppressed. I think the performance overlap would be a lot bigger for rifle gas if I was taking the can off a lot.

That’s odd. My +1 runs both. Ejects different angle obviously but runs all the different hand loads I’ve tried. Definitely the factory ammo. I haven’t shot all my load developments unsuppressed though.

 

[Hecouldgoalltheway]

I think if you have a quality adjustable gas block and a JP silent capture spring, (why wouldn't every AR you own have one?), gas systems haven't been an issue for any of the 5 I've assembled.

 

[Eric_F]

I'm sure I could tune it to run unsuppressed, but then with my high back pressure can (Polonium 30) I'd be getting pretty gassed out as the dwell time is pretty tiny it would need a lot of gas. Not a huge deal for me. Picture not really required but why not.

 

[Rob01]

Good morning everyone. I am looking at building a rifle in 6 ARC and I’m curious what part combinations people who have some time on their builds have had success with. Specifically I’m talking about barrel performance, gas system setup that has been functioning well and buffer tube setup. Thanks and I appreciate any insight!

If you want to build that’s great but you can buy and get a good rifle also. I had .223s so just ordered a 22” upper from Grendel Hunter. Got it in about 3 days. Put it on my lower and took it to the range. Ran great and was as accurate as I wanted. Cost me about $800 and I couldn’t be happier. Once I got my wind call down I was hitting 6” and 4” targets at 900 yards. My first time out with some Hornady 108 ammo I shot the below at 100 and 550.

6mm ARC Uppers | Grendel Hunter | The Modern Sporting Rifle

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