A friend gave me a mixture of about 50 NOS and well used GI and commercial M1 carbine mags- mostly 15s w/ some 30's.
Frustrated that, except for NOS GI, most commercial and used GI are problems- FTFeed, FTEject etc.
On some of the problem well used GI, I've changed the springs w/ NOS GI springs and still problems.
Cked the orientation of the springs, still problems.

It get expensive to feed mags to ck them.

Venting- "GI" M16, G3, M14icon, FAL mags all seem to generally function well. No comparison w/ the "flipping a coin" to see if a M1 carbine mag works.

Was it always this way w/ M1 carbine mags?
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