I'm not a metallurgist, but from the "feel" of my files and gravers, it works the same way that 12L14 barrel steel works. I think the nail in the coffin for this plug is that it's not something I'm comfortable putting my name onto. It's probably fine safety wise, and is hiding 90% of the time within the stock, but is a glaring and obvious fault when the barrel is out. Now to add another 5 hours or so to my tally on this pistol...
Jerry, I'm definitely taking Dave up on his offer, though I may try to remove the plug with a generous amount of penetrating oil and heat prior to heading to Bremerton. I'll bring the beer and a couple barrels and stocks to inlet for a good visit instead
. Dave B, I've got friends in Portland and will definitely let you know the next time I'm driving through Vancouver, would love to drop by!
Kutter - great tip about relieving the pressure from the barrel with that cut!
Thanks everyone for your thoughts on the plug - decision has been made to remove and replace it (one way or another). Below is a sneak peek of the pistol - still need a couple coats of glaze/finish before calling the rest done. Style-wise it's a bit of a mix between Dutch and French. Finished photos in another week or two.
Best,
-Eric