EFFIN-A MUZZLE BRAKEEASILY TUNE YOUR RIFLE FOR ZERO MUZZLE JUMPThe Effin A compensator is a fully adjustable compensator that can be tuned to the users weapon however they see fit. Holes located around the Effin A can be plugged with included set screws to allow the muzzle gasses to flow in certain directions. This means the user can tune the compensator to change how the muzzle rises while shooting.Watch YouTube : Effin A Compensator Review (fourguysguns)MAKE AN OFFER 220-0144 Don