Load up for your next range day with the Duramag® AR-15 .223, 5.56mm, .300BLK 30-Round Aluminum Magazine. Featuring durable aluminum construction with a corrosion-resistant finish, this aftermarket magazine boasts superior strength and lasting corrosion resistance in even the harshest environments. The anti-tilt polymer follower and the stainless-steel spring ensure smooth and reliable feeding with proper cartridge alignment in high-stress target and defensive environments. Duramag’s Aluminum .223 / 5.56 magazines have become the choice magazine for OEM, Law Enforcement, and Military Units throughout the world. There's no such thing as having too many magazines.