This screw on AK-47 phantom muzzle brake compensator is designed to easily attach to the standard AK barrel 7.62X39 equipped with 14 x 1 LH thread. This high quality steel muzzle brake for ak rifles reduces recoil, muzzle rise and flash with 4 slots to redirect muzzle blast. This AK-47 muzzle device is made specifically for AK's, it is notch for the front sight block detent pin. Muzzle brake is made in the USA and finished in Military style black nitride finish. One year limited warranty.