Coming from the UK, I'm jealous of you all because I've only ever had the opportunity to fire shotguns and air-pistols and rifles. (Yes I know that's beta)
But back in '91 I worked with someone who was a bit of a collector and imported stuff (I think it
was legally lol). So I got the chance to hold (not fire) two fairly impressive (to me) guns. I remember the one was called a Calico, and it had a sort of coke-can shaped magazine.
The other was a really heavy silver automatic pistol of some kind that he said he'd had to get from Israel specifically because the sliding bit of the gun was underneath rather than on top. He explained this was unusual and was to allow him to mount one of the first big-as-a-telescope laser sights. Tango and Cash had a lot to do with his purchase I think!

I can't remember what it was called though - I bet one of you guys can tell me?
BB related as he wrote me my first ever bodybuilding routine.... true story...