what does the barrel say?

my late grandfathers says full choke shoots awsome and is the best shotgun i ever shot and owned.
i think it will do fine with the barrel you have. is it a vent rib? or just has the plain bead on it?
the vent rib barrels where extra money and the ones with the bead where the cheapest.
also is it a 3" mag or 2.75?
if you would want to change the choke you would have to buy a new or a used barrel if you can find one. i know a front wood forehand grip goes for $300.00 in some places.
like everyone says HOLD ON TO IT !!! it is known as one of the best shotguns ever made. but the rem 1100 put it under.