When I was a uniformed cop I had a couple of incidents of struggling with suspects who had guns. One in particular, I recall the gun getting knocked out of his hands and doing a frisbee across the asphalt. No discharges.
Kinda funny though, I remember I was still struggling with the guy trying to cuff him and thinking "Holy crap I hope somebody friendly gets to that thing first if i don't."
I also recall giving someone an opportunity to drop the gun he was holding before things went bad for him. I startled the guy, as I came from a different angle and he was confronting other officers in the front of the trailer.
When I gave him his options (and let him know i was there) he acted as if the gun had just magically caught fire. He literally threw his hands up in front of him and let the gun go sailing into the hard packed dirt. No discharges, at least from the gun. He looked like he needed a new set of BVD's according to the guys in front who could see his face.
Nothing says fun and games like no contact orders, guns and alcohol.