You can find the Magpul PMAG 30 AR/M4 MOE Magazine here.

The Magpul PMAG 30 AR/M4 MOE Magazine features an impact and crush-resistant polymer construction, stainless steel spring for corrosion resistance, and an anti-tilt, self-lubricating follower for increased reliability. The PMAG MOE has a textured gripping surface and flared floorplate for easy handling.

Caliber: 5.56
Capacity: 30 Rounds
Color: Black