I knew the guy that assembled mine , he was serious 1911 collector , had some rare ones including a Singer
He had a parts cabinet with about 30 drawers of parts ....and bins of frames.
I mention I wanted a 1911 ( this was about 1985-86) ...he said he'd build me one , he knew his stuff. it was GI Mix-master but shot great....
I don't remember the price maybe $200
About 20 years ago , a dude at work said he wanted it ....said he'd pay up too ...he did !