"...the nitride treatment process (<600 deg F)..." Is more like 970F if it's gas nitriding.
A lot depends on how long the barrels are, but a 12 ga. Win M24 isn't terribly expensive. Start at about $600 on Guns International and the Winchester Collector's site(other gauges are worth more). And the barrels may or may not be connected with solder.
A pound of Johnson's Paste Wax runs $6.47 at Home Depot. Works well on wood too.
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