Mac,

They are just soldered. These guys make their living soldering (Simmons Gun Repair - ventilated ribs) so I figure they have done a good job of it. They do a lot of re-sleeving of barrels and magazine tubes so this must be old hat to them.

The ribs and quarter ribs are going to be the biggest headaches I suppose. The guy had a piece of steel stock the other day to make the quarter rib.

I have to keep reminding myself to have patience.

It is the single trigger (and light weight) that I am after.