9MM GP 1:10 4150 CrMoV, 1/2 - 28, Nitride | Selectable
9MM GP 1:10 4150 CrMoV, 1/2 - 28, Nitride | Selectable, Match-quality barrel feature Nitromet salt bath nitride to give them maximum wear resistance and durability that standard barrel finishes just can't match. Barrel has a Nitromet nitrided bore treatment for longer life than chrome without affecting accuracy. Barrels are made of 4150 CrMoV, chambered for 9mm, button rifled with 1-10 twist rifling, and machined to a standard government exterior profile. 1/2"-28 threads on the muzzle end.