FWIW I've owned a couple of Bul M5s in .38 super and 9mm. These were complete guns, not mixed and matched. They were very accurate in .38 super, reasonable in 9mm. Perfectly reliable in .38 super, extractor needed tweaking in 9mm. Note guns started as .38 super, 9mm barrel was added.
Kimber imported the Bul frames and mated their slides to them, Charles Daly imported complete guns, Marstar in Canada imported complete guns, some may have made it over the border.
Early Bul frames with a square cut trigger guard will not fit into standard 1911 holsters, later ones with the more traditional trigger guard shape will.
Bul make their own magazines, these may be hard to find. STI mags can be modified to work with a little filing of the body and mag lips.