FreedomIsntFree

I have a M1 Super 90 that came with 3 chokes. There are notches on each of them, but I don't see anything in the manual about which one is which. Thanks.

I owned a M1 Super 90 for about 8 years now and have shot it only a few times. The problem is I don't have a place near me where I can shoot outdoors with shot shells. I'd like to take it to the indoor range and use slugs, mainly just to get comfortable using the gun. But what about the choke? Can I shoot slugs with the choke in place? Should I take it out? Thanks for the help. Don W.