The Mauser bolt action system is based on 19th century Mauser bolt action rifle designs and was finalized in the Gewehr 98 designed by Paul Mauser. It is the most common bolt action system in the world, being in use in nearly all modern hunting rifles and the majority of military bolt action rifles until the middle of the 20th century. The Mauser system is stronger than that of the Lee–Enfield due to two locking lugs just behind the bolt head which make it better able to handle higher pressure cartridges (i.e. magnum cartridges). The 8×68mm S and 9.3×64mm Brenneke magnum rifle cartridge "families" were designed for the Mauser M 98 bolt action. A novel safety feature was the introduction of a third locking lug present at the rear of the bolt that normally did not lock the bolt, since it would introduce asymmetrical locking forces. The Mauser system features "cock on opening", meaning the upward rotation of the bolt when the rifle is opened cocks the action. A drawback of the Mauser M 98 system is that it cannot be cheaply mass-produced very easily. Many Mauser M 98-inspired derivatives feature technical alterations, such as omitting the third safety locking lug, to simplify production.