The Valken 300rd Metal M16 Hi-Cap airsoft magazine is a 6mm AEG high capacity magazine with a stamped metal shell for a more realistic look and feel of a real M4 magazine. This high capacity airsoft magazine fits most M4 or M16 style airsoft rifles, and holds 300 BBs. This AEG magazine also comes with a high quality spring and clutch system to ensure smooth feeding. You can find these airsoft magazines in black or tan colors.