Haven't done a darn thing with this in two months. I've just been sort of thinking my way through it. More and more I like the idea of a mono block, but fitting the barrel lump seems like it could be its own issue. Would it be strong enough to make a mono block for the barrels and the barrel lump that engages the frame separately and bolt and solder them together? I think if it is made with just the right tolerance the recoil force will all be on the faces of the frame, not on the barrel lump.

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Bob La Londe - CNC Molds N Stuff
Proffessional Hack, Hobbyist, Wannabe, Shade Tree, Button Pushing, Not a real machinist!