The only thing better than a normal pistol barrel is a threaded pistol barrel. All pistol silencers require one. SilencerCo noticed a market need for high-quality pistol barrels and stepped in to offer them. Holding to the same commitment to quality as all SilencerCo products, these threaded barrels are tough enough to hold up under the harshest conditions. Made Stainless with 416R Steel and finished in black nitride.   Glock Barrel Compatibility: G19: Gen 1-5, 19X, G45 G17: Gen 1-4 (not Gen 5)