For Thompson Airsoft Electric Full-Metal Body AEGs (item # CG43900, CG43901, CG43907, CG43908,CG71015). Holds 380 rounds.Easy to fill, just pour in 380 rounds through the top hatch. Easy winding spring dial on the bottom keeps tension on the ammo for smooth feeding. This magazine will not work with the Thompson Plastic Body AEGs: CG430902, CG43903, CG43904, CG43905, CG43906.