The CMR-30 is constructed of hard-coat anodized aluminum for the upper assembly and rails and houses the steel barrel. The collapsible stock is made with aluminum stock rods, and a nylon butt plate. The stock was designed to have a natural cheek weld when extended. The grip, mag catch, safety levers, stock latch, and operating handles are made of glass reinforced nylon (Zytel). The grip houses the frame which is made of aluminum. The bolt assembly houses a captive recoil spring assembly. MagpulA(R) flip-up sights included.