The LANCER Viper .308 Muzzle Brake (LVB-308-BK) is a "tunable" brake/compensator designed for precision shooters. Engineered with a blast chamber and four tunable jets, the Viper brake effectively reduces barrel movement making for faster follow on shots. In addition angled blast baffles are incorporated to reduce recoil and further stabilize the rifle.

Lancer has incorporated four jet locations on the top of the brake, the jets redirect gas pressure from the blast chamber creating a downward force on the muzzle of the rifle. Different size jets are supplied so the operator can tune the downward force. Tuning is a simple manner of changing the combination of jets until the desired effect is achieved.