I live in Michigan, where they make up gun laws on the fly. No suppressors, no full auto, no short barrels. So I have to satisfy myself with the semiauto PS90. It's still the most fun thing to shoot since I got my first .22.
The skinny 16" barrel is hidden by a dummy Gemtech suppressor, and I upgraded the standard sights with a 1.5x compact ACOG.
It's accurate, reliable, and a real joy to shoot. The only downside is the cost of the ammo, but all other kinds of ammo are getting expensive now, too.