The Magpul PMAG 20-Round AR/M4 GEN M3 Magazine is a 20-round magazine for 5.56x45 NATO/223 REM rounds. This PMAG features modified dimensions, making it compatible with both Colt-spec and non Colt-spec platforms. A long-life stainless steel spring and self-lubricating anti-tilt follower ensure reliable feeding, while the crush-resistant polymer housing adds strength and durability. This AR magazine also features a ribbed gripping surface and a flared floorplate for positive handling. With wider compatibility and reliable feeding, the Magpul PMAG 20-Round AR/M4 GEN M3 Magazine exceeds rigorous military performance standards.