Black Rain Ordnance AR-15 Rifle Magazine w/ Let It Rain Bullet Engraving .223 Rem/ 5.56 NATO 30 Round Black 1 Pack Polymer. 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/ Let It Rain Bullet Engraving: Manufacturer: Black Rain Ordnance Color: Black Fabric/Material: Polymer Magazine Capacity: 30 Round Caliber: 5.56x45mm NATO Gun Make: AR Platform Features of Black Rain Ordnance AR-15 .223 Rem/ 5.56 NATO 30 Round Rifle Magazine w/ Let It Rain Bullet 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/ Let It Rain Bullet Engraving Black Rain Ordnance MAG30LETITRAINB-30RD: AR-15 Rifle Magazine w/ Let It Rain Bullet Engraving .223 Rem/ 5.56 NATO 30 Round Black 1 Pack Polymer