Not too many my friend in what I call the average joe guns if they were a pump or semi for sure so most would be good for Trap in the 12ga versions
I never got deep into the O/U except the K ones when I was trying to break them all years ago and those I have sold off. SXS is the other one I do not collect other than my grandfathers model 21's .As a kid in my dad's shop the new product brochures would show up and most years I would start saving for the next model out
I pretty much did that until 13 years ago when I started the old cancer battle and almost stopped buying guns or became very selective and started to down size but thank God so far I am winning that battle and stopped reducing the herd . I love the 28ga and 16ga and have an easy 50 many makes and models between them alone. I think 33 or 34 in 28ga if I count the single shot ones
I will leave it at that since I could ramble about shotguns for pages and pages
Cheers