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. We recommend using our Valken Infinity BBs for use with this hi-cap magazine.