The KCI USA KCI-MZ026 is a magazine specifically engineered to coordinate with M1 Carbine firearms that are chambered in 30 Carbine. Crafted from resilient hardened steel, the magazine boasts an Electro plated finish for enhanced endurance and aesthetic appeal.Noteworthy is its high carbon steel spring deployed to operate the bolt hold-open follower, a detail designed with precision in focus. This feature further accentuates the magazine\'s performance and reliability.