There are a couple of things you can do.
First make sure there is clearance the length of the barrel, then take a dowel with some sand paper and even out the barrel channel.
this shouldn't take more than half an hour.
Also does it have pillars. If not another relatively easy fix using a small piece of hollow threaded tubing from a lamp.Just square up the holes by redrilling for the tubing then epoxy them in and then torque down the action.
All told maybe an hours worth of work and when you are done everything should look better.
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