Remington 870 Complete Mcs System What Kind Of Ammo To Use In A Remington 870 Express Magnum Shotgun?

What kind of ammo to use in a Remington 870 Express Magnum Shotgun? - remington 870 complete mcs system

I have a shotgun, Remington 870 Express Magnum shorter barrel it for hunting deer. How do I determine if it is scratched or not? They are usually striped. I opened the camera and saw the barrel and is very soft, but not sure.
Tell me if I'm not mistaken. If the weapon is dropped, if you sabot slugs.
Fragments of stripes, if you want it smooth-bore gun.
Thanks for the help of his friends.