The King Arms 516 PDW airsoft rifle is as versatile as it is compact. This rifle is based off of the M4 platform with extra features not typically found on standard rifles. At 6.2 lbs and just over 24 inches long with the adjustable crane stock collapsed, its's compact design makes it lightweight and perfect for CQB engagements against the opposition. Constructed from durable nylon polymer and aluminum parts for extreme durability. The monolithic upper receiver and RIS make adding your favorite aftermarket optics, grips, lights, lasers, and other picatinny/weaver-based accessories a breeze. It's high powered Version 2 7mm bearing gearbox outlasts many other competitors and is also Tokyo Marui Version 2 parts compatible for future upgrades.