The Thompson was invented by Brig. Gen. Thompson, but WWI ended before the general could get it into production. Thompson marketed the gun to civilians, and Al Scarface Capone was only too happy to use it. If you've got competition on the airsoft field, this Tommy gun will clear them out. This realistic replica comes with everything but a violin case. Thompson M1A1 sub-machine gun replica Auto-electric gun (AEG) Full-/semi-auto 450-rd drum mag full-metal body wood-grain plastic butt-stock and grips look very realistic metal gearbox reinforced steel gears metal bushings. Rear sight adjustable for windage and elevation. Vertical fore-grip for better balance 1.3 joules of energy 465 fps with .12g BBs, 350 fps with .20g BBs BAX system for better BB stabilization Includes 8.4v 1100 mah Ni-MH battery pack, 250 mah charger (4.4 hrs charge time). Rotate the key only in the direction of the arrow. Do not rotate the key in the opposite direction or you will break the magazine. The battery compartment in the rifle's butt includes a dark grey foam insert. Remove it with a corkscrew or long wooden screw if you'd like to use a larger battery such as sderbat6-mini.