I doubt it has been hotblued. Your barrels would probably be loose from a hot blue. Hot blueing will losen the soldered joints most of the time. You can attain a fairly shiney blue based on how fine a sanding job is done on the barrels prior to blackening. If only sanded down with 400 grit or such you will get a flatter looking finish. If you take it down to 600-800 grit you get a more richer shiny finish.
It looks like the bottom ribs on the 16g bbls have been drilled and the holes filled in.
The holes usually indicate a hot blueing.
Bbls are a real flat black, too.
OWD
The barrels do have a flat black appearance, however, both sets have a real nice ring and seem to be very solidly together!
