This is the Ruger AR-15 .223/5.56 30 Round Steel Magazine, manufactured by CPD Duramag. This magazine fits standard AR-15/M4 rifles chambered in both .223 Remington and 5.56x45mm NATO ammunition. Constructed from robust 410 stainless steel and T-460 coating, this magazine will survive many years of regular use. The orange Advanced Geometry Follower™ features an anti-tilt mechanism, ensures smooth feeding and reduces the likelihood of jams. A durable steel spring wire guarantees consistent tension and flawless functionality. The steel baseplate adds to the magazine’s overall durability. This Ruger magazine is a must-have for those who demand the best in terms of capacity, durability, and performance.