Also I think at this time loose powder and ball were usedand not metallic cartridges.
tuco s gun is a sudist copy of the colt navy 1851 because in this case the barrel is circular.the real name of this model is "griswold an gunnison" in a 36 caliber either. historicaly the gun s frame is not in steel but in an alliage of "bronze" (sorry i don't know the name of the metal alliage in english")
We went thru this before Beebs, they were available, S&W had then in 1852 and a lot of conversions were made to Colts by gunsmiths, somebody point this to the right thread.