A bubba fix would be to build up the rear of the magazine so it fits the longer opening and the rear lip engages. This would force the magazine toward the front of the mag well and then the latch will catch on the forward lip. This should position the magazine such that it would feed properly. Worst case is it doesn't work and you ruin a magazine that doesn't fit your stock anyway.
I've done something similar using JB Weld but any of the epoxy putty products would work as well.
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