Potomac Armory Mk12 gas block - Crane NAVSPEC model phosphated steel 0.75" from Potomac Armory MSRP: Was: Now: $52.85 Out of Stock
Knights Armament (KAC) M110 SR25 Gas Block, Knights Armament KAC 0.750" MSRP: Was: Now: $699.99 Out of Stock