KCI USA M1/M2 Carbine Rifle Magazine .30 Carbine 30 Round Black 1 Pack Steel 30RD. The magazine is constructed of hardened steel and an Electro pated finish. These magazines feature a high carbon steel spring to engage the bolt hold-open follower. Specifications for KCI USA M1/M2 Carbine .30 Carbine 30 Round Rifle Magazine: Manufacturer: KCI USA Color: Black Fabric/Material: Stainless Steel Magazine Capacity: 30 Round Caliber: .30 Carbine Package Contents: KCI USA M1/M2 Carbine .30 Carbine 30 Round Rifle Magazine KCI USA KCI-MZ026-30RD: M1/M2 Carbine Rifle Magazine .30 Carbine 30 Round Black 1 Pack Steel