Tapco Compensator Black Glock 17 Gen 3. Quick and easy to install 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. Specifications for Tapco Compensator: Manufacturer: Tapco Color: Black Caliber: 9mm Luger Threads per Inch: Non Threaded Gun Make: Glock Barrel Material: Stainless Steel Length: 2.25 in TAPCO TAP22007 COMPENSATOR GLK 17 What firearm models does the manufacturer say Tapco Compensator is compatible with? The manufacturer says that Tapco Compensator is compatible with Glock 17 Gen 3 Glock 19 Gen 3Tapco TAP22007: Compensator Black Glock 17 Gen