Just picked up this abomination last week and got some parts in for my MAC 9 DS(non-comp)! I snagged it for $715 shipped.
Found a used Stac P grip, magwell, grip safety, mag release, mainspring housing, and trigger for $200(Springfield Prodigy grip, mag release and MSH for $50 would have been a better value) because the original texture was… well it wasn’t textured, I’ll put it that way. Also got this rmr07 used for $275. We’re wheelin and dealin baby!
Already broke it down, lightly sanded(mostly just got rid of high spots) and polished all the internals, as well as the frame rails. Slightly beveled and rounded the areas on the bottom of slide that were hanging on the disconnector, lubed it up and racked it a whole shit ton while watching TV. I suspect the extractor will need some tuning because it wouldn’t let go of a round no matter how much I shook the slide, and it feels pretty heavily sprung but gonna put 500 rounds through it before anything else. I can’t make it to the range until next week, but will report back with thoughts and findings.