Originally Posted by
OldArmy01
Well I fired a few loaded @ 22.9gr in my 11.5" AR, I figured it has the least gas duration, so if it cycles, the 20 and 24" with rifle gas surly would be fine.
Not necessarily. The peak pressure with faster powders can drop by the time the bullet passes the longer gas systems' ports. Since you're matching a fast powder with a light bullet, you shouldn't run into problems with any gas system.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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