Springfield Armory 5.56 30-Round Magazine Black 30. 56x45 NATO (.223 Remington) polymer magazine for AR15/M4 compatible weapons. Along with expanded feature set and compatibility the GEN M3 incorporates new material technology and manufacturing processes for enhanced strength durability and reliability to exceed rigorous military performance specifications. Similar to the MOE PMAG the GEN M3 features a long-life USGI-spec stainless steel spring four-way anti-tilt follower and constant-curve internal geometry for reliable feeding and simple tool-less disassembly to ease cleaning. Specifications for Springfield Armory 5.56 30-Round Magazine: Manufacturer: Springfield Armory Color: Black Fabric/Material: Polymer Magazine Body Material: Polymer Gun Make: Colt Heckler & Koch Gun Model: M16 M4 AR-15 Gun Type: Semi-Automatic Rifle Carbine Caliber: 5.56x45mm NATO .223 Remington Magazine Capacity: 30 Round Quantity: 1 Package Contents: Springfield Armory 5.56 30-Round Magazine What firearm models does the manufacturer say Springfield Armory 5.56 30-Round Magazine is compatible with? The manufacturer says that Springfield Armory 5.56 30-Round Magazine is compatible with AR-15 M4 M16Springfield Armory AR6030G3: 5.56 30-Round Magazine Black 30