One thing I can think of is to check the alignment (Left/right) of the mag well with reference to the hop chamber. If it's out of whack either way it could cause what you're experiencing. The other is to not over tighten the two screws that secure the barrel/receiver assembly to the stock. The screw closer to the butt is ok to tighten a fair bit but the one closer to the muzzle can cause all sorts of magazine related problems if it's too tight.
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