Medium Raised rib version of the Invictus! see manufacturers description below. In our ongoing pursuit to make the best Target shotgun possible, Caesar Guerini has created the Invictus. Featuring the greatest advancement in over-under durability in many years â€“ the Invictus System. This revolutionary new system completely changes the way the barrel and action lock together when the gun is closed, making the whole system stronger. Additionally, all locking surfaces are now modular, creating a gun that is many times more durable than a traditional over-and-under shotguns. For the first time you can measure the life span of your shotgun not by how long you can shoot it, but how long your children and grandchildren can.