That's a full Graflex, not a slave. There's a wire from the display wrapping around the saber to hold it in place.
A Graflex slave unit doesn't have a button or lens.
Stormtrooper blaster is the one that sold at a Profiles in History auction in 2005 from the Joiner/Kurtz collection. It's a Sterling from Bapty reconverted with parts supposedly found at Bapty. I say "supposedly" because the grips don't match those used on any other screen used props. Scope rail is a replica. Scope is a type only seen once in ANH so the chances of it being screen used is low.
Severed hand is from the same auction.
Edit - The Luke lightsaber and the lightsaber on Vader's belt are from the same 2005 auction. I also doubt the authenticity of both because they have the same weird grips as the Stormtrooper blaster.
The Vader saber is made from Graflex slave unit mounted on top of another flash.