This is a Beretta Silver Pigeon Sporting shotgun.
This gun is very unusual in the fact that it comes with 3 sets of Briley barrel sleeves.
This allows the gun to fire 12 gauge, 20 gauge, 28 gauge and 4 10 cartridges. The 12 gauge and 20 gauge are also multi choked barrels. This effectively gives you 4 guns in 1 and the total lack of recoil in 28 and 4 10 is great for teaching newcomers and younger shooters.
Overall an incredibly unusual gun that is certainly a conversation piece.