Tokyo Marui M1A1 Thompson AEG The TM Thompson is a replica of the .45 caliber sub-machine gun produced by the Auto-Ordnance Company during World War II. Designed as a trench gun, this rifle features a beautiful faux wood stock, motor grip, and hand guard. The upper and lower receiver are historically accurate metal with the unique safety and selector switches only found on the M1A1. The sturdy magazine release is one-of-a-kind and operated as a lever instead of as a button. The magazine included is the "20 round" low capacity variant that only holds 60 BBs. Extended length high capacity magazines that can hold up to 420 BBs can be found on our AEG magazine page. The battery compartment is located in the stock. To access the compartment simply lift up the circular tab located on the buttplate, then lift and rotate the plate itself up and out of the way for installation. Then just reverse order and the battery has been installed. And if you "have to" upgrade the gearbox because stock is just too slow for you, Version 6 gearboxes are among the easiest to work on, so never fear! For the die hard World War II or 1920's Gangster fanatic, this is the rifle for you! *Note: Because of the stock, non-reinforced nature of Tokyo Marui products, we do not recommend using a 9.6v battery in this AEG.