Officially Licensed Heckler & Koch MP5 SD6 Collapsible Stock and A4 Stock Included
11.1v battery recommended (7.4v or 9.6v 1600 will also work), nun-chuck or stick should fit in the lower handguard area. Uses Tamiya plug type.
The downside to the HK UMP Gas Blowback SMG being so fun to shoot is that the rounds in your 30-round magazine go quick. Better grab a few extra mags to stay in the game until you're the last one standing!