The BC barrel comes with no sights, it's drilled and tapped just like all H&R rifle barrels, it has a 3/8" dovetail slot for mountng the front sight. You can order it with the Williams WGRS($18) or FP-Target($60) peep sights and/or a scope rail($13-$18). H&R uses a hooded Lyman 17A front sight w/inserts if you want that on it, don't know what they sell it for, it's $27 elsewhere. I don't know if they offer a dovetail blank, but you could ask, Marbles makes a nice one if they don't offer one.
Any rifle barrel that H&R offers can be ordered with a scope rail or sights, the 22" .45-70 barrel comes w/sights, order a scope rail in addition to the sights for $18 extra which includes a hammer extension. Or you can order the rail and extrension for nothing extra with no sights on the barrel.
The .405 Winchester would be a rechamber and rebore by a gunsmith after you buy a .38-55 barrel, cost for that service would be about $300.
The .45-70 BC or .38-55 Target barrels are $131 shipped and fitted.
Tim