Shotgun Barrel

Can I get a shotgun barrel that uses any round?

I have a 12 guage Remington 870 Express Magnum. I was just wondering if there’s a barrel out there that I can put on my shotgun that will use any round? Meaning, I could load a buckshot and slug in the magazine at the same time and nothing will get ruined when I shoot? Thanks.
How can I find out if my rifled barrel is partly rifled or fully? All I have is the rifled barrel and turkey barrel that came with the gun? Also, how do I check/change the choke?

my dad has one and it came with both barrels. the rifle barrel for his is fully rifled. just look in the barrel and if the rifling comes within an inch to the end of the chamber where the round fits then its fully rifled. he also has the turkey barrel. he doesn’t have the 3 1/2″ barrel though (he got it before the round was invented) but it can fire any type of round under 3 1/2″ for the 12 Gauge. sabots can be fired from the barrel, but i wouldn’t recommend it. the sabots are designed for the rifled barrel. and don’t fire shot from the rifled barrel, especially steel and copper plated shot, for obvious reasons. i’ve fired all shot from the turkey barrel except 000 buck shot. but even 00 buck wont do damage to it. maybe a little more damage than regular shot, but much at all.

Stevens Model 311 .410 Double Barrel Shotgun