The military issue 15 round mags are likely to be the most reliable in the M1 Carbine. Most of the 30 round mags you now see are knockoffs and are often unreliable. The 20 round mags are in the same class as the knockoff 30 round mags. I would not use a polymer magazine in the M1 Carbine.
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VCDL, GOA, NRA
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