Abstract: A receiver assembly for a handgun. The receiver assembly includes an upper receiver portion, a lower receiver portion, and a locking mechanism. The upper receiver portion includes i) a guide rail for receiving a slide assembly and ii) a magazine compartment for receiving a magazine. The magazine compartment defines a magazine insertion direction, and the magazine is pushable into the magazine compartment in the magazine insertion direction. The lower receiver portion is slidable onto the upper receiver portion in the magazine insertion direction. The locking mechanism is configured to couple the lower receiver portion to the upper receiver portion. The locking mechanism includes a locking element that is structurally independent. The locking element includes a contact projection and a locking projection. The contact projection form-fittingly engages with the lower receiver portion and the locking projection form-fittingly engages with the upper receiver portion.

Abstract: A receiver assembly for a handgun. The receiver assembly includes an upper receiver portion, a lower receiver portion, and a locking mechanism. The upper receiver portion includes i) a guide rail for receiving a slide assembly and ii) a magazine compartment for receiving a magazine. The magazine compartment defines a magazine insertion direction, and the magazine is pushable into the magazine compartment in the magazine insertion direction. The lower receiver portion is slidable onto the upper receiver portion in the magazine insertion direction. The locking mechanism is configured to couple the lower receiver portion to the upper receiver portion. The locking mechanism includes a locking element that is structurally independent. The locking element includes a contact projection and a locking projection. The contact projection form-fittingly engages with the lower receiver portion and the locking projection form-fittingly engages with the upper receiver portion.

Abstract: A firearm of the rotating bolt type includes a housing part made of plastic or metal, a metal bolt carrier guide, a bolt carrier that is guided by the bolt carrier guide and that has a bolt head rotatably mounted in it, and, held by the housing part, a metal barrel nut in which a barrel can be fixed and in which the bolt head can be locked. The bolt carrier guide is directly connected with the barrel nut so that it is rigid with respect to movement, at least in the longitudinal direction of the firearm.

Abstract: A firearm of the rotating bolt type includes a housing part made of plastic or metal, a metal bolt carrier guide, a bolt carrier that is guided by the bolt carrier guide and that has a bolt head rotatably mounted in it, and, held by the housing part, a metal barrel nut in which a barrel can be fixed and in which the bolt head can be locked. The bolt carrier guide is directly connected with the barrel nut so that it is rigid with respect to movement, at least in the longitudinal direction of the firearm.