Interesting subject. I wonder if the threading process on barrel and monobloc, due to the extended surface scoring involved, weaken the metal more than a smooth surface.

There is the alternative of the fretted barrel used by the French (Cannon Frette) where the monobloc is heat shrunk and sodlered onto the barrel. Ron Vella used liquid nitrogen to achieve a fretted barrel fit in his last project the 6.5mm.

I am wondering, not offering an opinion. Is there any risk of the barrels loosening and coming off the monobloc?