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Sig P320 FCU, various grip modules, with pro-cut slide and PMM comp and barrel won't cycle after trigger is pulled

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Oct 8, 2008
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With snap-caps: just racking the slide I can get them all to eject properly. Once I chamber and pull the trigger the slide jams up and it takes a lot more force to eject. I have experienced with live rounds as well.

Bought the pieces all separately and brand-new. I know the correct recoil spring is in there after having put the incorrect/longer one in there first. Comp and barrel were installed by a smith, but they couldn't figure out why this was happening either.

Does it sound like the slide or FCU? Thanks in advance.
 
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