Bought the ZEV drop-in trigger for my Gen4 Glock 17.  Installed it as instructed without changing anything on it and the trigger does not cycle normally.  In order to take down, I have to remove the slide backplate to free up the internals for disassembly.

I had this problem with a Ghost trigger (didn't realize it needed fine tuning), but figured the drop-in ZEV should work just fine after dropping it in (without gunsmith mod).

Any thoughts?

You might need to adjust your over travel and pre travel screws.

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