Thanks. Actually, I bought such a Bar-Sto 40-to-9 barrel, years ago, but have been unable to find it, since we cleaned-up after Hurricane Harvey. I looked where I thought that I had stored it, which would not have gotten wet, but it was not there. Maybe I will eventually find it, in some box or bag of gun stuff. It would be nice to convert my P229R DAK, permanently, to 9mm, with the Bar-Sto barrel, and with a 9mm extractor, especially if it would prove to reliably feed a good defensive load, such as my stash of G2 or Gold Dots.
I can still shoot .40 in my P229R DAK, in moderation, and, preferably, with an nicely heavy WML on the rail, and mostly with my still-healthy left hand. When I was wrecking my right hand, in the Eighties, with big-bore Magnums, I mostly fired the big guns with my right hand, and .38 Specials with my back-up/secondary Model 60, left-handed. I write lefty, and found it difficult to write reports, with that ancient artifact known as a pen,
if I fired many big-bore Magnum rounds lefty. (Yes, that was a clue, that I missed, for too long. Not until about 1990 did I finally admit to myself that I have K/L/GP100/1911/P220-sized hands.)