*Our forward Mount for the Mac-10 & MPA/Vulcan/Velocity .45 acp has three short 1.75" machined aluminum rails to add any components you want. You can add a lower grip, a laser on the sides, a flashlight or other components. You can also add grip covers to all three rails to give it a soft tactical grip. Our new mount fits over the barrel and has a thickness equal to the exterior base of the barrel allowing all the barrel threads to be used for a suppressor, muzzle brake, flash hider, our Blackout Barrel Extension. The mount is held around the barrel by 3 set screws and allows access to the receiver pins. Finished in our new matte black anodize. Includes mount, Allen wrench, and three machined aluminum rails. Rails are approx. 1.75" in length.