Normal usage will smooth the parts and make the trigger seem lighter or you can have a smith tune the trigger. I would try to get 500 rounds through it first to see if there are any other things that you want a smith to look at.
I presume you already bought the handgun. $850 seems like a decent price, but, as my nature, I would try to get it cheaper. I wonder why someone would sell a 1911 with so few rounds if there was not a problem or concern.
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