If one wished to add a shoulder stock to a pistol, what is the legal procedure, and could the pistol be taken interstate to a state that doesnt allow short barrel rifles or whatever the resultant gun is, if the shoulder stock was left at home? Does it get to be simply a handgun again and able to travel interstate without paperwork or complications if the stock isnt present? Does the original base gun need to be engraved with anything, or just have the paperwork on hand when out and about?
In this instance, the base gun would be either a Colt Single Action Army or Ruger single action. Would add a detachable shoulder stock, similar to what the original "carbine stocked" Colt SAA had in the 1880s, and later became known as "Buntline Specials"
This being the general idea.
I realize a 16" barrel would simplify things, but I really dont want a 16" barrel pistol. 7 1/2 or 9" seems OK for still being carryable out in the hills.