Constructed of steel with an electro plated finish these magazines will withstand the toughest corrosive environments. A hi-tensile compression spring and a bolt hold-open follower provide reliable feeding and long life. The removable steel base plate allows easy maintenance. Technical Specifications Weight 0.3lbs Color Black Compatible with M1 / M2 Carbine Caliber .30 Capacity 30 rounds Body Material Steel Spring Material Music Wire Finish Cation Electrodeposition Coating