Aero Precision Lambda PRS 30, Muzzle Brake, 308 Win/7.62MM, Black, 5/8X24 APVG100029AR1 The LAMBDA PRS chamber design virtually eliminates recoil allowing the shooter to stay on the scope and identify their impacts downrange. The first chamber allows an uninhibited flow of gas to the left and right of the shooter" while the three remaining chambers direct the gas backward acting as a buffer to help reduce the side concussion resulting in a more pleasant shooting experience.