AR15 223 MUZZLEBRAKE IZZY 4-PORT SLIP ON BUSHMASTER
Featuring four gas ports and a ribbed design to improve cooling. Machined of 4140 gun steel with a manganese phosphate finish - very effective in controlling muzzle rise. Slip-on for barrels with plain crowned muzzles. Can be installed without regard to port location and will still be effective; however most are installed with ports positioned 12-3-6-9 o'clock. The slip on muzzle brake requires drilling and installing a taper pin, and for extra safety, high strength Loctite should be used in addition to the taper pin (not included).