I’m going to have either a 20” or 22” .308win barrel chambered. Would moving to a plus one gas port location offer any advantage over a rifle length. I’m betting that this would still be reliable and most likely will smooth out the recoil impulse a bit. Does anyone have first hand experience?
.308 win with plus 1 gas
- Thread starter wade2big
- Start date
A rifle length tube on a 20" is plenty to keep it smooth. I personally wouldn't do any longer.
I would absolutely try it, but I'm weird like that.
If that is the case, one needs to be ready to drill the gas port. It's not hard, just FYI.
I’ve shot 18” .308 with rifle length gas. I really don’t think a 20-22” with a plus one would have any issues. The 18” I shot had a H3 buffer and an adjustable gasblock tuned and the extracted brass still had extractor depressions on the rim of the case. I would have the gas port opened up on the side of caution from the start on this one. I think adjustable gas blocks or something comparable is necessary on large frames anyhow.
Never know till test fire! I agree with the adj GBs. I've saved some over drilled gas ports with SA bleed off GBs.
If shooting suppressed and unsuppressed they are necessary. Should have said that I suppose.
Sample size of 1 here, but I went from a 16 in carbine system to a proof 20” +2 CAMGAS and it is freaking smooth. 6.5cm with adj gas block, running suppressed. Recoil is less to me than a lot of overgassed 556 I’ve encountered.
I order my barrels from X-Caliber. Their gas system/barrel length guidance is here: https://www.x-caliber.net/tech-info-2
I built a 24" barreled LR308 with a rifle +2 gas system that I absolutely enjoy shooting. It has the R+2 gas length, SLR adjustable gas block, VTLOR A5-length buffer tube and UBR stock, homemade (9.1 oz) stainless steel buffer, and a cut down A15 rifle buffer spring. I have the AGB tuned for hot (for an LR308) 168 grain handloads (dropping the brass at 3-4 o'clock) but it reliably shot Federal M80 147 grain ammo through it Friday without having to adjust anything. I attribute the ability to shoot a little hotter handloads to the additional delay in unlocking from the R+2 gas system and the heavy buffer. That's my theory and I'm sticking with it.
I'd say go for it -- R+1" on a 20" or +2" on anything longer.
www.snipershide.com
I built a 24" barreled LR308 with a rifle +2 gas system that I absolutely enjoy shooting. It has the R+2 gas length, SLR adjustable gas block, VTLOR A5-length buffer tube and UBR stock, homemade (9.1 oz) stainless steel buffer, and a cut down A15 rifle buffer spring. I have the AGB tuned for hot (for an LR308) 168 grain handloads (dropping the brass at 3-4 o'clock) but it reliably shot Federal M80 147 grain ammo through it Friday without having to adjust anything. I attribute the ability to shoot a little hotter handloads to the additional delay in unlocking from the R+2 gas system and the heavy buffer. That's my theory and I'm sticking with it.
I'd say go for it -- R+1" on a 20" or +2" on anything longer.
308 AR10 Build Info/Picture Thread
Nothing fancy. Just an older Sig 716 patrol in 7.62x51 that I customized a a few years ago. One of the early elite Cerakote colors, magpul furniture and TT trigger with atlas bipod. Hanging off the barrel is a Sandman S.
www.snipershide.com
Holy conservative batman. Always remember those broad guidelines are designed for the lowest common denominator gun assembler and to keep manufacturers from having to field "why gun not go bang?" phone calls from arfcom types.
Anyone with half a brain can get away with way better setups than a mid length 20" barrel.
I have a +2 20" X-Caliber that's pretty much always shot suppressed. So far it's my favorite .308 barrel and absolutely no problem with an AGB.
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