I have fit 2 kart 9mm ramped gunsmith fit barrels in my 1911s. One was an sti/fusion home build to replace the kkm barrel I had a gunsmith finish ream, which to him meant a 1/4" leade. I fixed that by turning it into a 9x23mm chamber. Wife wanted her 1911 back so I fitted a kart instead of kkm as the rifling twist is better. I had the kart barrel fitting kit and some building manuals that take you step by step on how to do it. Chambers were hand reamed with manson reamers.
Fit the other barrel in my buddy's Springfield loaded 9mm. He was not happy with the accuracy of the stock parts and sent it back to springfield to fix. They told him it was fine and sent it back. I got the gun and the barrel and bushing were way too loose. Got him an oversized bushing from egw and kart barrel. Cut his groups in half and he is much happier with the performance. Used hand tools and emory cloth to fit the barrels and bushings. If you are handy and patient it can be done at home.