MagPul 30 Round AR-15 Magazine, Black. The PMAG™ (Polymer MAGazine) is a lightweight 5.56 NATO, M-16 compatible magazine. It features an advanced impact resistant polymer construction, a pop-off Impact Cover for storage, and an easy to dissasemble design with a flared floorplate for easy magazine extraction from pouches. PMAG™ utilizes a resilient stainless steel spring for corrosion resistance.