Shop › AERO ADJ LOW PROFILE GAS BLOCK .936 AERO ADJ LOW PROFILE GAS BLOCK .936 $71.99 Aero Precision Low Profile Adjustable Gas Block, Fits AR15 with 0.936" Barrel, Nitride Finish, Black APRH101616C Add To Cart Added! Aero Precision Low Profile Adjustable Gas Block, Fits AR15 with 0.936" Barrel, Nitride Finish, Black APRH101616C