I think left-handed firearms were outlawed by George III. You never see one from his period.
I wish it were nothing more than flipping the CNC machine over, but there are a lot of holding fixtures, machine cut directions, etc., that would need to be reversed also.
Pistols are lucky - doesn't matter to them which hand they are held in.
While we are talking Jim into different rifles and such, how about a nice German Jaeger, say 1730-1750 or so. Walloping large bore, rifled, sling swivels, ornately carved brass furniture? Or a Rupp from the Golden Age?
And a number of reenactors would love rifles from the F&I or AWI periods. Even War of 1812. See, Jim, enough different ones to keep you and your family going for decades!