Lancer Tactical Metal Mid Cap 120 round 6mm BBs Magazine - mid capacity type Airsoft 6mm BB Magazine designed for use with airsoft rifles which accept magazines, such as M4/16 and many more! The magazine is constructed with an Alloy shell with Polymer internals. The magazine is designed to hold 120 round 6mm BB and is fed using a spring powered system meaning that no winding is required, and there is no more rattle.