This magazine from Matrix Diversified Industries (MDI) is a Magpul PMAG30 AR/M4 Gen M2 30-round magazine featuring a custom finish by MDI. This 5.56x45 NATO (223 Remington) magazine features impact-resistant polymer construction, an anti-tilt, self-lubricating follower for increased reliability, an easy-to-disassemble design with a textured gripping surface and flared floorplate for positive magazine extraction, and a USGI-spec stainless steel spring for corrosion resistance and field compatibility.