This Ruger AR magazine is made for weapons chambered in 300 AAC Blackout and fits the Ruger SR-556 AR-556 and other AR platform weapons. This magazine features stainless steel construction a brightly colored follower and a reliable internal spring. 30 round capacity - 300 Blackout Laser-etched to mark caliber Fits AR platform weapons including the Ruger SR-556 and AR-556 Ruger pairs these reliable stainless steel magazines with their rifles as they perform consistently and can be counted on for repeatable performance feeding ammo and locking your bolt back on empty.Looking for additional rifle magazine choices? We have a https://www.ammunitiondepot.com/magazines/rifle-magazines/Sort this category by caliber or rifle platform for more specific results.