A self-loading hand firearm with a barrel secured to a frame, a firing pin, a slide, and a closure which is held, in the front position of the slide, in a locking position on the frame and which is moved from the locking position into a release position by gas pressure of a fired projectile. The closure is formed at least in two parts with a closure locking mechanism, which has two lateral legs, and a closure impact base lying between the legs, the closure locking mechanism being provided at the legs with at least one protruding driver element, which engages in a recess of the slide, and with at least one retaining cam, which engages in a shoulder of the frame. The closure impact base and the closure locking mechanism are hinged to one another.

A self-loading hand firearm with a barrel secured to a frame, a firing pin, a slide, and a closure which is held, in the front position of the slide, in a locking position on the frame and which is moved from the locking position into a release position by gas pressure of a fired projectile. The closure is formed at least in two parts with a closure locking mechanism, which has two lateral legs, and a closure impact base lying between the legs, the closure locking mechanism being provided at the legs with at least one protruding driver element, which engages in a recess of the slide, and with at least one retaining cam, which engages in a shoulder of the frame. The closure impact base and the closure locking mechanism are hinged to one another.

A breech block with a bolt carrier, on which a bolt head and a locking device are arranged with two diametrically opposed locking elements pivotable from a release position to a locking position via a control element, for holding the bolt head in a locking position. The locking elements are mounted pivotably around a common transverse axis via journals and the control element contains front and rear support areas that abut against the locking elements for controlled forced movement of the locking elements into both the locking position and the release position.

A breech block with a bolt carrier, on which a bolt head and a locking device are arranged with two diametrically opposed locking elements pivotable from a release position to a locking position via a control element, for holding the bolt head in a locking position. The locking elements are mounted pivotably around a common transverse axis via journals and the control element contains front and rear support areas that abut against the locking elements for controlled forced movement of the locking elements into both the locking position and the release position.

A bolt head of a breech block includes a base element, a breech face arranged on the front of the base element, and a bezel enclosing the breech face in an annular fashion. The bezel is formed by several bezel parts detachably fastened to the base element.