KAK industries brake and linear compensator. 14x1 pitch, this is the standard threading for AK/AKM. (If you have an AK 74 or a K103, this will not fit your rifle.) 3.25 inches length of the compensator and 1.75 inches length for brake. 40.00 together, separate it’s 30.00 for the compensator and 15.00 for the brake.