The disconnector issue mentioned by Gerald is the most likely issue.
Sometimes these get "sticky" because old lubricant has aged and dried.
This would cause the firing pin not to reset properly.
If it's an all matching pistol, the fitment of the trigger train and sear should be correct, unless it was missed with at some point.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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