The ECHO 1 M16 DMR is a replica of the famous assault rifle that is in use with the U.S. Marines today. The M16 DMR is used as a designated marksmen rifle for extended ranges falling between the duties of a rifleman and a sniper. It comes with a full stock that will except most large battery packs. The working charging handle give this gun a realistic action that even higher priced guns like CA do not have. ECHO1 AEGs are fully upgradeable and compatible with most aftermarket external and internal parts. This airsoft gun includes a metal Standard magazine and is also compatible with other major brands of standard and high capacity after market magazines. This gun is a great choice for a designated marksmen rifle to round out your squad.