This extremely lightweight design is both rugged and rigid, weighing only 8oz yet providing an extra 6in. of usable rail to the rifle. Made form 6061 aluminum this extension features four MIL-STD 1913 rails, and two anti-rotation QD sockets for push button swivels. A solid mounting setup, yet allows the rifle to be fully serviced including removal of the gas piston. Can be removed with the barrel assembly. The MI SCAR Rail Extension comes in Black or Flat Dark Earth, is 100% made in the USA, and has a lifetime warranty.