Designed to fit your M1 Carbine chambered in .30 Carbine, this standard capacity 30 round magazine provides smooth and reliable feeding. Constructed of steel with an electroplated finish, using a high-tensile strength compression spring and a bolt hold-open follower provides for long and reliable life. Specifications Weight: 0.3lbs Compatibility: M1 / M2 Carbine Caliber: .30 Carbine Capacity: 30 Rounds Body Material: Steel Spring Material: Music Wire Finish: Cation Electrodeposition Coating