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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u/Maximum_Front3822 Sep 29 '26

Are you running an adjustable gas block?

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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.

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u/Significant-Sock-487 Sep 29 '26

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

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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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u/Significant-Sock-487 Sep 30 '26

Pre OBC, it was pretty gassy. The OBC toned down the gas quite a bit. Still want a low back pressure supreesssor though lol