I had one of those J22's a few years ago. Bought it from a buddy for $30.
I mainly bought it out of curiousity.
It was the worst cycling pistol I ever shot. Bang, bang, click. Click (clear) bang, click (clear) click (clear) bang, bang, click (cuss)....etc. That is until I tried some CCI Minimags. It loved those. It would only jam every fifth magazine running those.
Had my fun with it and later traded it for an old Bear recurve bow......awesome trade!