Just learned some good news. Bar-Sto make a 9mm barrel that will fit in a .40 S&W hi power & it is supposed to work. That would save a lot of time and money since I was going to buy a used BHP slide and a Bar-Sto barrel to convert my .40 BHP.
"...9mm barrel that will fit in a..." Still requires fitting by a smithy and a heavier return spring. And it'd still be less expensive than a whole slide.
The .41 AE barrel I put in years ago wasn't a great idea. (Would have been worse if I hadn't bought 500 cases too.) Suspect it needs a far heavier spring than was suggested in the gun rag article that sucked me in.