The l5awm 300blk has been specifically engineered for use with subsonic 300 blackout ammunition, particularly 200+ grain cartridges.The updated internal geometry allows these longer heavier bullets to stack properly, which increases reliability when compared to a traditional.223/5.56 magazine.The outside of the magazine body is molded with 300 blackout markings and the magazine ships with a contrasting flat dark earth base plate for easy visual identification.Caliber: 300 BlackoutCapacity: 30rdFinish: SmokeModel: L5AWMMaterial: PolymerModel Fit: AR-15Capacity: 30