Shop › FAXON ADJ 3 SCREW .750 LOW PRO GB FAXON ADJ 3 SCREW .750 LOW PRO GB $73.60 Faxon Firearms Adjustable Gas Block, Fits AR-15 Barrels, .750" ID, Matte Finish, Black GBA-LP-750-3 Quantity: Add To Cart Added! Faxon Firearms Adjustable Gas Block, Fits AR-15 Barrels, .750" ID, Matte Finish, Black GBA-LP-750-3