Pin fire shells are easily made from normal brass or plastic hulls. One merely needs to make the pins, drill a proper sized hole in the appropriate location at the rim and there is your pin-fire. Percussion caps are used as the internal ignition source. It is a handloading proposition only.
The gun is in nice shape - I'd shoot it - black powder only, of course - and no Pyrodex, Clean or Clear shot or T-7, real BP only.