The fully adjustable Luth MBA-1 Carbine Buttstock mounts to a rifle with a standard A2 commercial buffer tube and offers an additional 1in cheek rest height; and an additional 1 1/16in length of pull with the extended buttplate. The cheek piece not only moves up and down, it also moves back and forth on the stock. It is fully ambidextrous and can be comfortably used shooting off either shoulder (cheek piece pre-installed for right handed shooters but can be installed on either side for right or left hand shooters). At 18.4 oz. the Luth-AR MBA-1 weighs roughly half that of comparable stocks. Fitting all .223 and most .308 AR style rifles, this ergonomic stock is quick to install and manufactured of strong glass filled nylon. Comes with A1 Buttstock Screw to connect to A2 standard buffer tube, and Incorporates Castle Nut and Lock Ring in the design.