With respect, there is no danger of that breech letting loose. If I had thought that, I wouldn't have built it.
The "Material" in question is a carrier/support system for a steel powder chamber. Nothing more. Nothing less. The steel powder chamber has a wall thickness of .250 inches. Much more than the wall thickness of a Traditions barrel. Which is .1875 inches.
What I built is no different than inletting a steel tang and breech into a wooden stock just ahead of the wrist. Exact same concept. My piece is sturdier because it's completely encapsulated.
My build went even further and pinned into place the "Material" in question. Again, no chance of that breech moving rearward.
Folks who really took a good long look at it would understand what I'm saying. No danger. None.
Instead, folks saying he used the "Material" in question should understand that logs and iron hoops have been used to make cannon barrels many moons ago. Successfully.
This forum watched a guy shove so much black powder into an 8 or 4 bore shotgun that the wooden stock literally exploded. Pictures were posted. It could have killed or severely harmed the builder.
But that thread was not taken down for liability reasons.