Is it just the one mag or do they all jam ?
If they all jam in the one marker I would first check to see if the "peirce " nipple is bent or cross threaded.
Check to see if the mag release is free with full travel both ways.
If it is just one mag beeing a pain, check to make sure the outer O ring that seals to the pin is intack and lubed (not broken and laying in the valve)
Hope some of this helps
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