Please note that the early versions of the Snider were literally converted into breech-loaders by chopping off a lump of barrel and adding the Snider breech mechanism - called the shoe - and breechblock. That is the appeal of the Snider - nothing else changed - even the hammer was the same.
My two Sniders, both bearing 1862 Enfield locks, ended up in Canada, with the Short rifle taken into service just before Confederation on July 1st 1867, hence its lack of a DC stamp [Dominion of Canada]. By way of making up for that omission, the three-band rifle has a diamond DC stamp on each side of the butt.