Glock OEM Glock 21 Threaded Barrel 45 ACP M16X1LH Thread Pitch GLSP. These Pistol Barrels by Glock eliminate the need to purchase an entirely new handgun if you own the already installed barrel. This Glock G21 45ACP Threaded Barrel Thread Pitch easily installs with your original threaded bushing and provides an excellent shooting platform for your weapon. Equipping your handgun with a Glock G21 45ACP Threaded Barrel also helps prevent wear and tear on internal components. Add a Glock G21 45ACP Threaded Barrel to your handgun for a reliable and dependable system that will deliver long-lasting performance. Specifications for Glock OEM Glock 21 Threaded Barrel 45 ACP M16X1LH Thread Pitch: Manufacturer: Glock Color: Black Gun Make: Glock Gun Model: Glock 21 Condition: New Package Contents: Glock OEM Glock 21 Threaded Barrel 45 ACP M16X1LH Thread Pitch What firearm models does the manufacturer say Glock OEM Glock 21 Threaded Barrel 45 ACP M16X1LH Thread Pitch is compatible with? The manufacturer suggests that Glock OEM Glock 21 Threaded Barrel 45 ACP M16X1LH Thread Pitch is compatible with Glock 21Glock GLSP39895: G21 45ACP Threaded Barrel Black