Hi Estcrh. I have looked everywhere to find photos of a Toridor barrel with the breech plug removed. No luck. Here's a photo of my Japanese Matchlock barrel with the breechplug removed. This is an original I shoot. But, I've never seen a Toridor barrel even removed from a gun to inspect the breech area. However, stay tuned, as I plan on removing the barrel from my Toridor to see the breech assembly. Like you, I have always been curious to see what the breech plug and the interior of the barrel look like at the breech end. I probably won't be able to do this till the end of the year. But I will take photos as I go along and Post on the Forum.
The Toridor "pistol" above still looks like it was made that way. It just does not look like a cut-down to me.
David: I have always felt the same as your comment about the breech plug installation, but never knew for sure. But, I believe you are correct. Since I plan on making mine a shooting gun, the sweated breech plug can be replaced with a threaded one I can have made. I need to make sure that the breech end of the barrel is straight with the rest of the bore and does not have what's called a "powder chamber" at the breech, similar to early medieval hand gonnes. Should be interesting. Rick.