Systems for a firearm are provided to increase safety, reduce complexity, and improve precision of the weapon. In general, examples of the systems including a safe axis firing pin that prevents unintended discharge are described herein, where the firing pin is not aligned with the primer of a chambered cartridge until the user intends to fire the firearm. Embodiments of the system are capable of modular installation and generally include a user-actuated trigger configured to displace the firing pin from a safe axis to a firing axis, by rotation, translation, or a combination thereof. Additional features are provided to prevent displacement of the firing pin by input other than the trigger, e.g., if the firearm is dropped. In another aspect, examples of the systems described herein include a barrel interfacing a slide where the barrel and slide include features to centrally align the barrel as the slide completes a cycle.

Systems for a firearm are provided to increase safety, reduce complexity, and improve precision of the weapon. In general, examples of the systems including a safe axis firing pin that prevents unintended discharge are described herein, where the firing pin is not aligned with the primer of a chambered cartridge until the user intends to fire the firearm. Embodiments of the system are capable of modular installation and generally include a user-actuated trigger configured to displace the firing pin from a safe axis to a firing axis, by rotation, translation, or a combination thereof. Additional features are provided to prevent displacement of the firing pin by input other than the trigger, e.g., if the firearm is dropped. In another aspect, examples of the systems described herein include a barrel interfacing a slide where the barrel and slide include features to centrally align the barrel as the slide completes a cycle.

An interchangeable safety selector that includes a generally cylindrical lock member rotatable between a safe and a fire position, wherein when the lock member is in the safe position a first portion of the lock member blocks movement of a portion of a firing mechanism of a firearm; a projection formed on each end of the lock member; and at least two lever members, each lever member having a recess mateable with the projection of the lock member, wherein the lever members are interchangeable, wherein one of the lever members is secured to a first end of the lock member via interaction of the projection and the recess and is further secured to the first end of the lock member via a screw.

An interchangeable safety selector that includes a generally cylindrical lock member rotatable between a safe and a fire position, wherein when the lock member is in the safe position a first portion of the lock member blocks movement of a portion of a firing mechanism of a firearm; a projection formed on each end of the lock member; and at least two lever members, each lever member having a recess mateable with the projection of the lock member, wherein the lever members are interchangeable, wherein one of the lever members is secured to a first end of the lock member via interaction of the projection and the recess and is further secured to the first end of the lock member via a screw.