Did you notice however, that it did take Michael a bit to find it? Remember he had to feel around a little? I always thought that was a nice touch to that scene. It seemed for a brief moment we saw a little panic/fear in Michael's face as he was feeling around for the gun, as though he was thinking it wasn't there. It wasn't like he just reached and retrieved it right away.
TIS
With all of the searching and reaching for the gun that Michael did, I would think that some or part of Michael's finger prints got on the gun, on the part of the gun that wasn't taped. With a Captain being executed, you'd think the Dept. would go over the gun very thoroughly. But, I guess that there wasn't enough there to work with. Imagine that poor waiter being interrogated as to what the shooter looked like.
It seemed for a brief moment we saw a little panic/fear in Michael's face as he was feeling around for the gun, as though he was thinking it wasn't there. It wasn't like he just reached and retrieved it right away.