Black Rain Ordnance AR-15 Rifle Magazine w/ Don't Tread On Me Engraving .223 Rem/ 5.56 NATO 30 Round Black 1 Pack Polymer MAG30DONTTREAD-30RD. 56x45 NATO (.223 Remington) AR15/M4/M16 magazine made of advance polymer material. It is a light durable and excellent alternative to the standard M4/M16 USGI aluminum magazine. Specifications for Black Rain Ordnance AR-15 .223 Rem/ 5.56 NATO 30 Round Rifle Magazine w/ Don't Tread On Me Engraving: Manufacturer: Black Rain Ordnance Color: Black Fabric/Material: Polymer Magazine Capacity: 30 Round Caliber: 5.56x45mm NATO Gun Make: AR Platform Number of Rounds: 30 Features of Black Rain Ordnance AR-15 .223 Rem/ 5.56 NATO 30 Round Rifle Magazine w/ Don't Tread On Me Engraving Sturdy Impact resistance polymer with textured grip Anti-tilt super follower Heavy duty non-memory and non-corrosive stainless steel spring Package Contents: Black Rain Ordnance AR-15 .223 Rem/ 5.56 NATO 30 Round Rifle Magazine w/ Don't Tread On Me Engraving Black Rain Ordnance MAG30DONTTREAD-30RD: AR-15 Rifle Magazine w/ Don't Tread On Me Engraving .223 Rem/ 5.56 NATO 30 Round Black 1 Pack Polymer