Re: Which 1911 to avoid for home smithing
I work on 1911's daily and have never had a problem fitting parts to a Sig 1911, except for their external extractors....another post mentions RIA cracking by the rectangular hole for the slide stop to be engaged by the magazine, that can happen to any 1911 that doesn't have that part of the slide rail cut out. i've seen it happen on Colts and Springfields so I don't believe it's RIA's metalurgy in question. If you'll notice all newer Colts are cutout in this spot now, so they don't get frames back for cracking.
I've built up a few RIA's for customers who just couldn't afford Colt or Springfields....the RIA's haven't had any problems yet, one of them is going on 5000+ rounds. I personally shy away from Kimbers, as I'm not a fan of MIM parts and will not do any action work on them unless I replace all the internal MIM parts, same as I do on Sig 1911s. Para 1911s are fine made pistols, but i don't care for their aluminum frames. Caspain slides and frames have always been great quality. STI are pretty good, but have some MIM in 'em.
ETA: I do not work on Tarus 1911s, they are very soft. it's not worth sinking any money into one in my opinion. I do know some guys that have them and are perfectly happy though. Norincos are kind of spotty, being hard in some spots, and soft in others. then you get one that's super hard. I stay away from Norincos as much as possible.