A lock-up system for break-open guns that sidesteps the inherent weakness of the bar action system. Between the breech end of the barrels and the traditional standing breech, in battery, a separate tilting block fits into a recess on the underside of an integral rear extension of the barrel(s), relieving virtually all the flexion force between the traditional standing breech and the bar of the action. When the gun is opened, the barrels raise at their breech end leaving the tilting block behind. The actual receiver, thus, could possibly be made of aluminum or even plastic.Patented by Franz Jaeger in 1908. Used today in Blaser's Model S-2 double rifle and in many of Ferlach maker, Schiering's guns.