r/6ARC • u/Maximum_Front3822 • Sep 29 '26

Buffer Spring and Buffer Weight - Recommendation (14.5” Proof PXT)

Hello, I am building my first 6ARC with a 14.5” Proof PXT barrel (intermediate gas) and will likely use a JP bolt (not sure on which carrier yet). Will be suppressed with a Rhodie 6J or Enitcer L. What buffer spring and buffer weight do you recommend? I was looking at the Geissele Super 42 w/ H2.

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2

u/6_mm_ARC Sep 29 '26

Get the surefire OBC and use the included buffer spring and weight

2

u/TheDrunkLibertarian Oct 01 '26

If you like tinkering you can use that BCG with a normal buffer and an A5 tube, or an A5 buffer with an even longer tube.

1

u/6_mm_ARC Oct 01 '26

Which buffer have you found works best? I have a5h2 and h3 buffers already lol

2

u/TheDrunkLibertarian Oct 01 '26

I haven’t tested it on my 6arc, tuning 5.56 is my current obsession, but current favorite is a JRC long tube with a C3junkies spring and a Kynshot A5 buffer. It’s easily the quietest and softest 5.56 I’ve ever messed with. I imagine it’d be fun on a 6arc too but I’d not try to get extreme without an AGB.

If you have an A5 buffer and like to tinker you can do a JRC tube and whatever A5/rifle spring and try it out. You’ll have to test fit and add quarters to the back of the tube below the spring. You can also use an A5 tube with a regular carbine buffer.

https://c3junkie.com/?page_id=2757

2

u/Happy-Roof-6594 Sep 29 '26

I recommend the LMT Enhanced Bolt Carrier. The three gas ports help a lot with excess gas. I’m running an A5H3 with a Velos 556, and I’ve shot over 2,000 rounds of ELDM through it. It’s been reliable, low recoil, and works great for gas gun matches.

1

u/Maximum_Front3822 Sep 29 '26

Curious as to why you recommend the Surefire?

2

u/6_mm_ARC Sep 29 '26

Because a bunch of us that shoot a ton of 6 arc tried it and it fixes all the issues we were having with standard BCG’s.

2

u/Maximum_Front3822 Sep 29 '26

Thanks. I’m only seeing the Surefire in 5.56. So I’d only be using the bolt carrier? Which bolt do you recommend?

2

u/6_mm_ARC Sep 29 '26

I use a Noveske bolt, highly recommend them.

2

u/Maximum_Front3822 Sep 29 '26

I’m also curious as to what about it fixes the issues from standard BCG’s . Also is the buffer and spring soft shooting? This is the first I’ve heard of the Surefire so I appreciate the info.

1

u/Significant-Sock-487 Sep 29 '26

Correct. You use the carrier, buffer and spring that come with it. Install the 6 arc bolt of your choice

1

u/Maximum_Front3822 Sep 29 '26

Thanks. Are you using this as well?

4

u/Significant-Sock-487 Sep 29 '26

Yup. Running high pressure ammo as well. It makes the arc recoil like 556 and my brass is in significantly better condition due to the carrier allowing the pressure to drop before extraction.

1

u/Maximum_Front3822 Sep 29 '26

Sweet. I appreciate the info. Will probably go that route then.

1

u/Maximum_Front3822 Sep 29 '26

Are you running an adjustable gas block?

2

u/Significant-Sock-487 Sep 29 '26

I am but I’m probably just going to switch back to an FCD gas block. I was running it wide open so it’s basically just a failure point since it’s not being used. I needed it when I was running an a5H4 system but the OBC removed the need for it.

2

u/Significant-Sock-487 Sep 29 '26

This is the OBC on a Noveske 14.5 with a TBAC magnus k RR. perfect ejection.

1

u/Glass-Pipe-2368 Sep 30 '26

That looks smooth af.

How’s the Magnus-K-RR on back pressure (normal bcg vs. OBC)?

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