Plugging the bore: mandatory with a hot process, recommended but not absolutely mandatory with a cold process. I've never seen any rusting in the bore using Laurel Mountain, although the dowel I use to support the barrel does pretty much plug it up. For the hot process I use a wood dowel with a cloth patch .
Browning the lock: in general, no, certainly never to the same amount as the barrel. Sometimes you see a slightly browned lock for the purposes of antiquing the overall look.
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