Beretta APX Muzzle Brake 9mm 1/2x28 Black. This compensator profile is specifically designed to follow the slide profile of the pistol to ensure a smooth sillhouette and look. Specifications for Beretta APX Muzzle Brake: Manufacturer: Beretta Color: Black Caliber: 9mm Luger Gun Make: Beretta Gun Model: Beretta APX Features of Beretta APX Muzzle Brake Remove the thread cap from barrel Screw the compensator onto the barrel and tighten to ensure correct alignment with the slide and guide rod Tighten the lateral positioning set screws Package Contents: Beretta APX Muzzle Brake What firearm models does the manufacturer say Beretta APX Muzzle Brake is compatible with? The manufacturer suggests that Beretta APX Muzzle Brake is compatible with Beretta APXBeretta E02939: APX Muzzle Brake 9mm 1/2x28 Black