Magpul PMAG. The PMAG (Polymer MAGazine) is a lightweight 30-round 5.56 NATO, M-16 compatible magazine. This PMAG™ features a curved body and pop-off storage/dust cover that alleviates pressure from the magazine feed lips, allowing for long-term storage of loaded magazines without risk of feed lip creep that often causes malfunction in standard aluminum magazines. PMAG utilizes a resilient stainless steel spring for corrosion resistance and a controlled-tilt, self-lubricating follower for increased reliability. Available in Black and Flat dark earth colors and with or without a window on the side for quick reference of ammo levels.