Our compensator muzzle brake for your Glock 9mm pistol is perfect for your threaded barrel when you want to protect your barrel threads in style and also tame the recoil on your Glock 9mm pistol. Precision machined from T6 6061 aircraft aluminum and finished off in a type II hardcoat anodized finish for a sleek look, this compensator muzzle brake for your Glock will look great on your threaded barrel and allow you to follow up shots and stay on target easier. No need to leave your threads exposed to potential damage, keep them protected and keep your shots on target. Please ensure your barrel is threaded 1/2-28 thread pitch. Installs easily using 4 included set screws with a 1.5mm hex bit. You can use 1.5mm allen keys, but it is HIGHLY RECOMMENDED you use 1.5mm bits instead as they taper and thicken at the base. This allows you to really tighten down the set screw without stripping the head due to the tapered thicker base.