I had the same problem with my 14. The stock was inletted just enough to all the magazine to contact the action before the latch could engage to lock the mag in place. If you look to see where the latch button is located without the magazine then try install it you'll probably see its stopping short. You may also see the plate at the front action screw is slightly below the stock surface.
You can remove both the screws and the floor plate then put a small washer between the plate and stock to shim it out a bit.
Bill
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