One of the most prolific rifles on the market, both for real-world firearms and airsoft alike, the AR-15/M4 rifle has proven itself to be one of the best platforms to date. Cybergun's officially licensed COLT M4 CQB cuts no corners. By building this rifle from the ground up using durable metal components, this rifle is incredibly durable. With metal externals such as the upper and lower receivers, buffer tube, and outer barrel assembly this rifle is rock solid. The metal RIS system allows for picatinny/weaver compatible accessories such as lights, lasers, grips, bipods, launchers and more to be easily mounted to make the rifle perfect for any skirmish or situation. Internally, the metal Version 2 gearbox is compatible with a huge assortment of aftermarket upgrade and replacement parts meaning that this package not only has a rifle that is affordable but can be upgrades and lasts a lifetime. A multi=position crane stock holds the included 8.4v battery. Sling mounts and on the front, receiver, and stock make mounting an aftermarket sling a breeze. The rear iron sight can be adjusted, removed entirely, or used along with aftermarket optics such as red dots, holos, or scopes.