AR-12 Semi Auto Shotgun w 15 shot magazine, alternate between slugs and 9 shot loads to clear behind doors. Definitely Rock Island VR80
9mm Semi, 4.5lb trigger, easy to conceal, carry, draw and fire on the run. Probably a S&W MP Shield 2.0, but I could choose several that meet the specs.
AR-15, Semi, good range, light, rapid fire, automatic. Probably an LWRCI-DI, but there are a lot of good ones.
4th choice, Truck gun like Ruger PC Charger w 50 round drum, folding brace and red dot. 9mm. Could also sub in CZ Scorpion with same setup.
5th choice, AR-10 in .308. A bit heavier, but better range and more punch than the AR-15. My choice would be the Savage MSR-10 Long Range.
When it comes to 9mm pistols you need to shoot several to find what works for you. I have owned several expensive 9mm autos including an Sig 226 and a Kimber. My EDC is a Ruger SR9C. For some reason I can shoot a tomato at 25 yards with it. It just works for me.
Bingo on the alternating slugs/buck shot. I’ve got a Black Aces Bullpup and 10 10-round mags. I don’t get the fascination with pump shotguns this day in age.
I have 3x Ruger Security 9’s with 6 mags each, 3x Glock 17 Gen 5s with 10 mags each... and I have about 15 30-round glock mags that work in the pistols as well. I also have a 50-round drum but its not dependable.