My younger son's future f-i-l has a PARA GI Expert single-stack 1911 and he wanted me to work the trigger on it because it was both stiff and had a very noticeable "spot" in the middle of the pull.
First off, after taking it down, I realized it had the Series 80 firing pin system (not a big issue, but it adds to the work).
Second, and most important find, was MIM cast guts and a LOT of casting "flash" lines on the parts. The biggest offender was the disconnector. It had a heavy casting line (vertically) right down the middle. It was very pronounced where the spring rides it.
The first plan was to try and make it better (at least shootable) without buying parts, and then get parts later.
With a fair amount of gentle "massaging" and polishing of all friction surfaces and pivot-points, I actually got a smooth trigger pull. It's still heavier than I like (some tweaking of the sear spring and a different main-spring will help) but it is crisp and breaks even...with no creep and most of all, no hard spots.
I guess the biggest shock was that PARA was using the cast parts...... I know more and more makers are going to that (especially in their 'economy lines') but didn't expect it to be that big of a pronounced issue in the PARA gun.
Anyway, I gave it back to him so he could run a couple hundred rounds through it, and then he can decide on what he wants to do. I'm thinking a good set of guts from Ed Brown or Cylinder & Slide.