The D&H .300 Blackout optimized magazine features high visibility badging for quick identification, a proprietary follower design and has been dimensionally adjusted to perform specifically with the full range of .300 Blackout rounds. The magazines also include a red follower for further distinguishing these magazines from others. These magazines have the internal rib positioned to improve function with a wider variety of projectiles in 300 AAC Blackout and with other .30 caliber AR rounds like 7.62X40 WT. Because these magazines are based off 5.56 parent magazines they will still feed and function in 5.56 rifles as well. These quality military grade magazines feature a slick black Teflon finish and D&H Red anti-tilt follower. Shop Palmetto State Armory for the Best selection of AR parts and accessories!