Re: 1911 collet bushing?
Ed Brown has a beautiful match barrel/bushing combo if you are wanting to replace both barrel/bushing. It's fitted (the bushing/barrel, not the barrel to slide) and is some of the best quality I've seen for a very reasonable price thru Brownells. Bought their commander size for the last one I built, very impressed with it.
You could also just do an oversized bushing like mentioned above, would be the way to go if your barrel is still good; hand fit it or use the reamer tool to get a good fit on lockup, it's not too difficult to do and pretty safe area to work on.
It's good to have spare parts, although only thing that's busted on me with 1911's is a firing pin spring, (still shot fine, discovered it after cleaning it) nothing else I can think of. pretty solid piece
"Loud noises don't end gunfights.... well placed shots do."