TAPCO Glock(R) 19 Compensator - The TAPCO Glock(R) 19 Compensator fits Gen 3 Glock(R) 19s. Quick and easy to install, just slide it onto the rail and screw it on to secure it. Unlike other compensators, you won't need a threaded barrel. It includes a picatinny rail so you can mount needed accessories underneath and with an integrated glass breaker. Its time to upgrade you Glock(R) with the TAPCO Compensator. Fits Glock(R) 19 Gen 3 withRail Bolt On Installation Integrated Glass Breaker Incorporated 2.25in Picatinny Rail