450-round drum mag Fits King Arms/Cybergun Full-Metal Thompson AEGs Metal construction 6.5"x1.5" For Thompson Airsoft Electric Full-Metal Body AEGs (item # CG43900, CG43901, CG43907, CG43908,CG71015). This magazine will not work with the Thompson Plastic Body AEGs: CG430902, CG43903, CG43904, CG43905, CG43906. Attention customers! Be sure to read the directions written on the box. Only rotate the key in the direction of the arrow shown. DO NOT rotate the key in the opposite direction. It will break the magazine.