Yeah, I'm looking for cheap.
I've built four guns on Essex frames and five on Fed Ord Rangers and they all work fine. I figger anything available today has GOT to be of higher quality, having another 20 years of tech to get everything worked out.
Kinda thinking of building up one in .38 Super. I've never had one of those. Anyone making .38 Super slides? Could I build a gun that can switch between .38 Super and 9mm with just a barrel and mag change, in other words, the slide and ejector would be good for both? I can't think of any reason why such a thing shouldn't be do-able. (Swapping the extractor between the two shouldn't be too big of a hassle if that's necessary.)
The RIA frames are cast, but they are damn good. If you want cheap, that is THE way to go. But give SARCO a call, they're most often out of those frames...be patient and you'll get one.
The Caspian frames are very good, but I've found they take a bit more work than other makers. The last two I built had the inside cut for the safety under-cut meaning the tab on the safety that holds it inside the frame when installed needed to be radically filed to get them to fit. I thought this was pretty bad, that's not something you should have to do when fitting a safety.
Rails were oversized, and probably more oversized than they needed to be, but that's not that big of a deal, I expect that. I got one with 30lpi checkering and it looked like it was cast in, so I had to do a lot of cleanup on the checkering...was still worth it, that's easier than hand filing checkering.
I built one RIA frame 1911 from an RIA frame a friend had, so I don't know if this was off a gun, or a frame ordered from SARCO. But it went together easy-peasy.
One gripe I have with the RIA's and many other makers is the front strap isn't properly radiused, so there's a big gap between the front strap and the grip panels. This is because they use the same cutter they use on the dust cover radius to save machining time. If you do checkering, that radius has to be cleaned up first for it to look right.
For Frame, Slide, and Barrel I'm very impressed with the quality of RIA. They are HARD, that's for sure. They are not always the prettiest, but they seriously have it where it counts.
I've never seen 9/.38 Super frames for sale from RIA. But if you open up the frame for a ramped barrel, it just doesn't matter.
Kevin