This is a great all metal M4 variant with Knights Armament trades and an upgraded BCM mk18-length hand guard. The internals are stock G2 G&G. This SR15 is in great condition and ready to hit the field! Includes 1 magazine. CNC machined aluminum alloy fully licensed SR15 receiver assembly Knight's Armament ambidextrous selector switches, magazine release, front and rear sights Stamped Knight's Armament trademarks Full length top rail provides vast amounts of real estate to mount optics and other accessories Metal version 2 gearbox with 8mm bearings and a bearing spring guide G&G's inline wired G2 burst control MOSFET and electronic microswitch trigger contacts mate up to a 25,000 RPM motor