Bigfatdave, what tools?....
nothing complicated or specialized
A non-marring punch and hammer for the bolt-stop pin
Something to pop the MSH latch out with
A non-marring hammer or padded hammer to get the upper on and off the lower
This can be accomplished many ways:
Nicer toolset:
dead-blow hammer or mallet
little bitty plastic pick for MSH latch
brass punch
Common toolset:
the hammer from your toolbox, padded with whatever you find around
a punch from wherever
a small screwdriver or spent shell for prying
Ghetto toolset: (I actually used this set on my uncle's gun while on vacation!)
large steel-toed boot as padded hammer
broken chopstick, one piece was the punch, the other was the prying tool