A firearm includes a frame, a slide assembly, an actuator, a bolt assembly, and an adjuster. The slide assembly includes a threaded bore, the slide assembly releasably and slidably coupled to the frame. The actuator includes a body and an extension, the extension protruding from the body. The bolt assembly includes a catch. The adjuster includes a first end, a second end, and a plurality of threads. The first end includes an interface configured to accommodate the extension of the actuator. The plurality of threads are disposed between the first end and the second end. The plurality of threads are configured to interface with the threaded bore of the slide assembly such that rotation of the adjuster within the threaded bore of the slide assembly by the actuator translates the bolt assembly and thereby facilitates firing ammunition having different casing lengths.