CZ Custom CZ 75 SP-01 Shadow 9mm Luger Threaded Pistol Barrel 5.2 in 1-16 Polished Silver. 550in Extended Length - This is the bigger diameter barrel. It will not fit in standard CZ75. The Standard CZ75 has a smaller (0.502in I.D.) Bushing. Specifications for CZ Custom CZ 75 SP-01 Shadow 9mm Luger Threaded Pistol Barrel: Manufacturer: CZ Custom Color: Silver Finish: Polished Fabric/Material: Stainless Steel Barrel Length: 5.2 in Barrel Twist Rate: 1-16 Flutes: No Caliber: 9mm Luger Barrel Material: Stainless Steel Gun Make: CZ Gun Model: CZ 75 Shadow CZ 75 SP-01 Phantom CZ 75 SP-01 Shadow CZ 75 SP-01 Tactical CZ 75 SP-01 Weight: 5 oz Gas Block Journal Size-Diameter: 0.55 in Firearms Threads Per Inch: 1/2x28 Features of CZ Custom CZ 75 SP-01 Shadow 9mm Luger Threaded Pistol Barrel Fitting may be required Gunsmith installation recommended on barrels Thread protector not included Package Contents: CZ Custom CZ 75 SP-01 Shadow 9mm Luger Threaded Pistol Barrel What firearm models does the manufacturer say CZ Custom CZ 75 SP-01 Shadow 9mm Luger Threaded Pistol Barrel is compatible with? The manufacturer says that CZ Custom CZ 75 SP-01 Shadow 9mm Luger Threaded Pistol Barrel is compatible with CZ 75 SP-01 CZ 75 SP-01 Tactical CZ 75 SP-01 Shadow CZ 75 SP-01 Phantom CZ 75 ShadowCZ Custom 30123: CZ 75 SP-01 Shadow 9mm Luger Threaded Pistol Barrel 5.2 in 1-16 Polished Silver