The GEMTECH Muzzle Brake is for users who want less felt recoil less muzzle climb and faster follw up shots this is the device for you.Features: Quickmount lugs for use with all GEMTECH 7.62mm suppressors Increased size of 3/4" wrench flats for installation Extended portion behind lugs for use on shorter barrels Overall length of 2.4" for 14.5" barrels Precision mounting shim kit included Available in 5.56mm (1/2-28) and .30cal (5/8-24) Built in carbon cutting grooves