Shop › MAGPUL PMAG 20 AR 300 B GEN M3 BLK MAGPUL PMAG 20 AR 300 B GEN M3 BLK $15.15 Magpul Industries PMAG M3, 300BLK, 20 Rounds, Fits AR Rifles, Black MAG1182-BLK Quantity: Add To Cart Added! Magpul Industries PMAG M3, 300BLK, 20 Rounds, Fits AR Rifles, Black MAG1182-BLK