I bought one of these about 10 years ago it is .21 cal smoothbore 'gallery gun' and made with only fifteen component parts and it seems that this was Quackenbush's first airgun with push-in, Gat-style cocking and loading. I managed to buy some original .21 cal slugs from Protek a number of years ago but not sure if they still have them. An interesting early development with a patent dating back to July 1881.