the trigger-Tech is a cartridge trigger(drop in). I have it installed with those fancy Dan no-walk pins. I thought I read where you don't have to use those little set screws to push the cartridge up against the stock pins to keep them from falling out. Wrong...

One of the other guns has a Timney single stage 3.5 lb single stage cartridge in it. I like it pretty well.

I don't think I'd much like to tear either of them apart. They look complicated!