Bul M5 IPSC model is reliable in 9mm. I assume the standard Bul is as well.
Marstar is importing the Bul, see if they will sell you the aluminium mag well, LPA adjustable rear/ fibreoptic front and ambi safety. These are the only upgrade bits needed to bring the Bul to IPSC model specs. A .40 S&W variant is available, I'm unaware of the .45 gap being sold in this gun, however a custom gunsmith should be able to chamber a new barrel, the standard .45 ACP mags should work. Of course, the question is why? .45 gap is a way for Glock to sell more guns, not a superior cartridge. The Bul is a series 70 gun without the firing pin safety. My experience with Buls is with the full size model, I've no experience with the commander.
I've only ever fired one magazine through a Norinco so I can't comment on them.