Muzzle Brake

The Muzzle Brake (also known as a Recoil Compensator) is a weapon attachment designed to redirect the weapon's propellant gases with the effect of lowering the recoil of the weapon and the rising of the barrel during automatic fire.

Battlefield 4
The Muzzle Brake is a new weapon attachment seen in Battlefield 4 that was seen during the E3 2013 live stream for the game.

The attachment is designed to reduce the recoil of a weapon, at the expense of lowering the accuracy of a weapon by increasing the dispersion of bullets coming out of the weapon's barrel.