Now, if it was an older rifle of any historical significance that would be different.
The thing is Eric, it very well could be. Not too long ago southern longrifles were considered pretty much junk. Times have changed and now those rifles and guns are appreciated and studied down to the last detail.
I hate to be the jerk of the thread, I'm really not that disagreeable.
I'm all for restoring some guns to shooting condition. Honestly a rifle like that is a very good candidate to bring back as a shooter. In my opinion he went too far when he stripped the barrel. I also think the wood and hardware was overly cleaned.
My opinion is, with care he could have had a shooter without compromising as much originality. There are proper methods to clean these old rifles and still preserve the originality.
I also think he should have researched this rifle more before jumping into a restoration/ refinish.
Most back action rifles are, well, just ugly. This one has good lines and the pierced patchbox set it above most IMHO.
Those English locks are commonly found on shotguns and I had one with dolphin hammers. If you look the hammer, although well done does not quite match the engraving of the lock. Possibly this was an American build with a English lock or the hammer may have been replaced by a very competent smith.
morelic55, You may be able to preserve the original plug. The tang likely can be repaired. This may be the best course of action because the plug threads may be obsolete. I would strongly suggest sending the barrel to someone like Bobby Hoyt or at least getting advice from a reputable BP gunsmith who restores antiques.