Anybody familiar with the choke markings on a SIG/Rizzini fixed choke O/U shotgun. Looks like they have "0"s stamped on the side of the barrels. One has 3 and the other 4 I think it is. The guy I got it from said it was an IC and Mod. The owners manual only speaks of choke tubes, and this gun has fixed chokes. Just trying to check him out, 'cause what ever it is, IT IS! I'm stuck with what ever that might be!