I too have the all-steel Scottish pistol from MVTC. I've posted pics in one or two threads - check out the topic "Scottish pistol, by way of India"I too have the all-steel Scottish pistol from MVTC. I've posted pics in one or two threads - check out the topic - Post: Scots Pistol, by way of India(Topic#215652).
I've since shot it with a .490 ball, thick patching, and 40gr. of FFFg. Accuracy was terrible, but it was fun to shoot, and one can't expect much from a smoothbore without sights.
I don't know whether the breechplug is welded or not, as I can't get the barrel off the frame - see the previous topic mentioned - but I have shot it safely. Of course, I regularly used to shoot my Ultra-hi "Tower" pistol, and that has a welded breechplug. That was something that I didn't know as a kid, but I'm still here.