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The first thing I'd check is the hardware that pushes the rounds to the top of the box magazine. Both the follower and its spring need to be free of any binding.
With an empty magazine, does the follower press easily all the way down and come back up when released?
Are the sides of the magazine inside walls and the follower free of corrosion and very smooth?
Is the follower spring weak?
Is the follower spring bent such that pressure on the follower's not keeping the same force on both ends of it?
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All good advice. All should be done before altering the feed rails (polishing, smoothing).