The Bushmaster XM-15 Mid-Length MOE features a mid-length gas system for smoother recoil and a 16" barrel that is chrome-lined in the bore and the chamber. This model includes the following MOE components: hand guard (accepts rail sections), MBUS rear flip sight, pistol grip (accepts MIAD storage cores), vertical grip, PMAG magazine, and adjustable stock with strong A-design and rubber butt pad.