M1A1 Carbine stock slack

[INLAND44]

Its a special case with this situation, because you don't want to change the receiver so as not to mess up the perfect fit it has in the other stock, plus the fact that the M1A1q recoil plate is different than the standard one and of a lighter construction. I've never messed with an M1A1 but it looks like you could shim out the recoil plate with metal that would not be seen, and fix your problem. Not exactly 'GI' but better than gooey tape.
If you could modify the receiver, the problem would be quickly solved - the 'tang' on the back of it would be peened to hang the receiver correctly in the M1A1 stock. That's what I would recommend doing. Changing a carbine back and forth between stocks is not the way to get a proper fit and keep it.
But, until you tried it after fitting it to the M1A1, you don't know that it wouldn't fit the other stock as well as it did.

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