nylons or panties over over a vacuum make a handy parts finder (among other things...)
Yes the sights from a Shadow will fit on the 2, however, the front sight is a 7.5mm tall vs a 5.5mm on a Shadow. If you went to fixed rear and front you could probably use the same ones.
Total tear down and re-assembly of a Shadow/2 should take maybe 10 minutes, max, and that's with a piss break in there too. They are pretty simple guns to work on. Curious as to why you're changing the trigger spring?
Yes the sights from a Shadow will fit on the 2, however, the front sight is a 7.5mm tall vs a 5.5mm on a Shadow. If you went to fixed rear and front you could probably use the same ones.
Total tear down and re-assembly of a Shadow/2 should take maybe 10 minutes, max, and that's with a piss break in there too. They are pretty simple guns to work on. Curious as to why you're changing the trigger spring?