Good compatibility with major brand M4 rifles Precision feeding, better than hi-cap magazines Stealth operation; no rattling sounds Lightweight construction makes it easy to carry multiple magazines Mag and dump pouch friendly OEM Factory direct pricing Constructed of durable hard polymer material, the 6mmProShop mid-cap magazine is lightweight and can take a beating. The mag features a standard design making it great for all types of M4 magazine pouches, and compatible with most major brand M4 AEG rifles.