Pietta Black Powder Revolvers

Lately I've taken notice of black powder revolvers made by Pietta in the Midway and Cabela's catalogs.  I've thought it'd be interesting to have a black powder gun, since you can fairly easily craft powder for them, and they're fairly inexpensive.  Plus, one can get .45 Long Colt conversion cylinders, although those cost almost as much as the revolver itself.  That presents an interesting concept: for less than $500 you can get a pistol that shoots metallic cartridges and is completely under the radar, i.e. no 4473 and no background check.  I'm surprised that the anti-gunners haven't blown up over this one.  Granted, the .45LC cylinders are only for cowboy loads, not smokeless powder, but still.