The Polymer80 .50 Beowulf AR-15 magazine features a heavy-duty, reinforced polymer body, with an innovative floorplate design that ensures this mag will consistently hold a full 10 rounds of .50 Beowulf. At the same time, this mag extremely strong - ready to take the knocks and bumps of competition shooting - AND also lightweight. Full 10-round capacity Heavy-duty polymer mag body Advanced floorplate design gives full ammo stack support For use with .50 Beowulf ammo ONLY Available in Black, Flat Dark Earth & O.D. Green to match your Polymer80 AR-15 receiver Most importantly, the Polymer80 team designed this magazine expressly for the unique size, Mfg: Polymer80