You have a very nice gun and you should shoot and enjoy it. I can assure you that the target trigger and hammer are not original to a 1950 military. They weren't original to 1950 Targets either. Any estimates of shipping date on the 1950 Military are highly speculative because the guns were very slow sellers. There were so many 1917s circulating that the new model was hard to move.

If you can find diamond checkered magnas and standard trigger and hammer it would be original looking.

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Bob.
SWCA 1821