The closest one I can think of is the Remington rolling block pistol, this is an original gun in .50 Navy, a very short .50 Cal., single shot antique pistol which requires no registering or papers or anything, I've made bullets for them and some members on here have one. They usually go for $1200 and up as they are a really nice old gun, and draw a premium here because of their "antique" status. Sharps did make some single shot pistols, with the Sharps falling block action, but one would need to apply for a mortgage for one. Uberti is making a copy of the Remington Rolling Block Pistol, but it is restricted and in .45 Colt.......shoot straight!....Ben