blume, The actual trigger fits perfectly in the action, requiring only a pin removal, and then the pin replaced and the safety reassembled (my experience with Timney triggers on several Tang Safety M77s), however there is a need to make some inletting mods. Minor by my experience, but some shaving of wood inside the inletting around the trigger cut was necessary. Triggers are excellent however.
I have made the assumption that we are talking about a tang safety gun. The MKIIs are a whole other thing, and should NOT require the mods I spoke of, thus less labor. If I am not mistaking, for the MKIIs it is pretty much drop in for the custom trigger components. In the tang safety it is a whole sale removal of the trigger and other components, and a new trigger "housing" is pinned in.
Notice the "housing" which will interfere with the inletting.
Notice the safety rod shape, requiring some inlet relief on the side of the trigger inletting
The factory stock with the inletting relieved to fit the action back in the stock
Now two hours??? Not by my experience. Sounds like a gunny with a flat rate schedule, developed by an ex General Motors mechanic, worked on the gun. :wink: