Mission First Tactical 3 Prong Ported Muzzle Brake, 223REM/556NATO, Fits AR-15, Crush Washer Included E2ARMD1 Reduces muzzle brake with the aid of 4 ports on top. The 2 ports on either side direct gas horizontally keeping recoil to a minimum. The front three prongs help direct the remaining gas and concussion forward from the shooter. All these elements make up a very comfortable muzzle brake for indoor and outdoor shooters. Where other muzzle brakes direct gas only horizontally MFT's comp takes it a step further.