Originally Posted by WR Moore

The cylinder would have to be machined and fitted to the frame, so it's possible. However, foggy memory suggests that practical may be another story. The N frame was the frame used for the conversions.

Case forming would be interesting, at minimum. I do recall a similar concept that used a plastic insert/sleeve that went over and supported the shoulder. If that's used on the B&D, one would have to wonder where you'd get the sleeves. [Maybe the sleeves were used in the experimental setup to avoid the cartridge setback problems that plagued the .22 Jet and were determined to be unnecessary? ]