I have a Kirst Konverter fitted to my ’58 Remington, and I love the thing. Mine is chambered for .45 Colt, and out of the 8 inch barrel on the Remington, recoil is a mild “thump”. It’s far more accurate than it has any business being, shooting into one ragged hole at 50 feet.
I did not know that they also made one in .45 ACP. You’ll have to scroll down a bit on the page to see it, but a .45 ACP single action Remington gives me some ideas for a bit of a custom gun.
Of course, it remains to be seen if my gun ADD can hold out long enough to actually purchase the parts for said custom rig.