Batteries are not included, LiPo 7.4v or NI-MH 9.6v butterfly style recommended. The M4 Viper Elite assault rifle from Black Ops USA is a competitive, solidly built AEG that looks great and shoots even better. With fiber optic flip up sights, a free-floating, quick release rail system, and an adjustable crane stock, this rifle is ready for battle right out of the box. The Elite version of the Black Ops Viper platform has upgraded internals for maximum accuracy and dependability, including a metal gearbox and wishbone style metal hopup. The M4 Viper Elite delivers up to 380fps with .20g BBs. The M4 Viper Elite is also a solid platform for upgrades and customization, compatible with most M4 internals and with plenty of rail space for optics, grips, lights, and other accessories.