ProMag Industries ProMag, Magazine, 30 Carbine, 15 Rounds, Fits M1 Carbine, Steel, Blued Finish CAR-A1 ProMag magazines are made in the USA and backed by a lifetime guarantee against manufacturer's defects. Magazine springs are precision wound using heat-treated chrome silicon wire and each and every step of the assembly process is checked and double checked in order to maintain the same consistent level of quality.