Some of the currently available M1 Carbine magazines are not built to the correct specifications so they may not work in all M1 carbines. That is the case of some 15 and 30 round mags I purchased out of the state of Maryland for my M1 Carbine. After my investigation into the reasons for them not working and not seating well in the magazine compartment of the Carbine, I came up with a modification as shown in the video.

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