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If you intend on Suppressed Subsonic MAKE SURE to get a pistol length gas system ..
if you want to run 230-247 gr projectiles get a 1:7 twist and it should still shoot 150’s just fine ..
Also get a name brand .. many of the lesser brands are coming with the wrong gas hole size for subsonic use ..
Adj gas block is a nice feature and can make life simpler ..
powders will be 4198, Lil gun, H110, RL7
Std spring and buffer usually .. If you have issues full cycle on suppressed you can try a H3 Buffer