I thought that I was the only one with a dedicated LLama lower for a .22 conversion.LB, I too often wondered about that as well. While most of my 1911's over the years (I honestly don't have a clue how many but I've not been without at least one 1911 since I was 19 and often had a couple or more! I'm 70 now and only have 4, although the Llama Officers Model has been wearing a .22 conversion slide since 1998!) have worked just fine out of the box, I intentionally bought some that were, let's say picky as to what they would eat (and thus cheap!). In most cases all I ever did was polish the feed ramp and try a different mag, which in most cases fixed the problems. A couple (never Colt) needed a bit more work but all did ok eventually. I really don't know what's going on with all the "bad" 1911's out there but it has not been my experience!
Mine is a full size though.