Started Mark I Build

[sundance8]

Don't know about others but I use dye penetrant only. When you do the math on weld strength vs load at detonation the Bren is actually very lightly stressed. Speaks again to its superb design.
In order to get full penetration I usually have a few spots that I grind out and reweld. Happens most often on the inside. The backup bars work good but occasionally you get a small void and it is obvious.