SilencerCo 9mm 1/2x28 Threaded Barrel. Holding to the same commitment to quality as all of our products the threaded barrels are tough enough to hold up under the harshest conditions. Made of 416R stainless steel and finished in black nitride (some models remain stainless). SilencerCo threaded barrels come with a Thread Protector. Specifications for SilencerCo 9mm 1/2x28 Threaded Barrel: Manufacturer: SilencerCo Color: Black Threads per Inch: 1/2x28 Package Contents: SilencerCo 9mm 1/2x28 Threaded Barrel