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.308 AR Pistol Build

I've been playing with the idea of building a 12.5" .308 AR pistol, any suggestions for buffer weight, barrel twist, brands. Any info helps.

I would contact Craddock Precision for the barrel. They will probably tell you that 13.5 with a midlength gas system or a 12.5 with a carbine +1“ will be best for reliability suppressed and unsuppressed. They also recommended 1-10 twist when I inquired.
 
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My newly arrived pistol. It needs to be field tesed to make sure its a keeper though.
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Noveske N6 Leonidas
 
These shorty .308s get pretty violent once you're around 12" in my experience. One of my friends tamed his a decent amount with a JP Silent Captured Spring, I believe the H2 version with one of the stiffer springs installed. May be worth it for you to check it out.