Guncrafter Industries very own .50 GI Magazine. Fits M1, M2, M3, or M4, 6 round capacity flush fit. GI Magazines are made of heat treated stainless steel and are of heavier gauge steel than standard 1911 mags for increased strength and rigidity. The magazines are positioned higher in the frame to increase reliability and give smoother feeding. The self lubricating polymer follower has a steel insert at the slide stop contact point for longer life. Our magazines are slightly longer in order to make room for an extra power chrome silicon spring for increased life and reliability. Our flush fit magazines feature a TIG welded floor plate for ultimate reliability.