That is great news ed. I checked the 1st 5 listings here
https://www.gunsinternational.com/edsgunshow-.cfm
and there is no mention of MWT or end-of-chamber wall thickness.
Do you personally do the measurements? What wall thickness gauge do you use?
In addition to the > .090" end of chamber minimum, what are your other minimal thicknesses for gun that you sell?
Do you have different criteria based on barrel steel, or for small gauge guns?
Could you please share the end of chamber WT of that 20g L.C. Smith you have listed?