27 hours later, the
DevCon 2-Ton Epoxy is ready to test!
First pic: Scrap wood set up in mill vise. Once again, I pulled with both hands/arms, to the point of my feet sliding on rough concrete floor...Didn't budge. I must admit, I was fairly confident it wouldn't separate.
Second pic: 12" Crescent wrench on top scrap piece...The join separated.

I wasn't expecting that.
Third pic: Closeup of the scrap pieces. On the top, you can see the surfaces where the epoxy was...The wood fibers separated, not the epoxy...On the bottom, I belt sanded the squeezed-out epoxy [bottom edge of wood], just to show it was nice and hard...And sandable...
I think that will conclude my demonstration for now...I found out what I wanted to know...
I finished de-greasing & stripping the Arg Mauser stock and the wood extension, tomorrow I'll do the join on them...