Shop › FAXON 3 SCREW .625" LOW PRO GB BLK FAXON 3 SCREW .625" LOW PRO GB BLK $33.11 Faxon Firearms Gas Block, Fits AR-15 Barrels, .625" ID, Matte Finish, Black GB-LP-625-3 Quantity: Add To Cart Added! Faxon Firearms Gas Block, Fits AR-15 Barrels, .625" ID, Matte Finish, Black GB-LP-625-3