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A bit of steel wool on those heavily parked clips or a buffing wheel on your Dremel should solve the problem. I've had some that would load easily in one rifle but not in another. If getting the heavy park off them doesn't help toss them. CMP sells a box of 25 for twenty bucks that work just fine.
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Lots of premature ejection suggestions.
Problem solved?
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Just to add. I had all sorts of problems with the HXP 1972 clips that came in the sealed tins.
A run in the tumbler with some HXP cases solved about 1/3 of the problems. The rest of the troublesome clips became single load clips.