Had one for a while, was a fun shooter. It was a 1st Conversion 58 Caliber Rimfire. Had Bob Haley make some rimfire cases for it, and other than being somewhat a PITA to reload, they worked fine. Dies and mould are a bonus, Starline makes CF brass.
More info:
https://www.americanrifleman.org/content/origins-of-the-trapdoor-springfield-the-allin-conversions/#:~:text=Allin%20was%20granted%20U.S.%20Patent,utilized%20without%20modification%20or%20replacement.
