Armaspec Rifter Linear Muzzle Brake 5.56/.223 - 1/2-28 - No Shield

The Armaspec Rifter(TM) Muzzle Brake has two ports that have a solid bottom to direct gasses out and up, greatly reducing felt recoil and muzzle rise. .223/5.561/2-28 PitchStainless Steel coreBlack Nitride FinishInstallation Instructions:The best way to install the Rifter properly is if you think about the face of the barrel like a face of a clock, the top or 12 o'clock of the Rifter Core where you can see the little notch on the bottom part, this notch needs to align with the 12 o'clock on the barrel. First install the crush washer, the side with the cone goes towards the barrel and the wider side towards the Rifter Core, that allows you to tighten your muzzle device hand tight. Once you do, place your armorers wrench or 3/4 open ended wrench on the wrench flats and with a decent amount of force tighten until it lines with the 12 o'clock on your barrel. The key is tightening in short increments as to not tighten the muzzle brake too much and go past that 12 o'clock point.