Firearm systems and methods for accommodating different bullet casing lengths

A firearm, comprising

• a frame assembly;
• a barrel;
• a slide assembly releasably and slidably coupled to the frame assembly, wherein the slide assembly defines a lateral aperture;
• a bolt assembly including a surface;
• a firing pin;
• and
• an adjuster comprising:
• a body defining a first bore, defining a leading surface, and having a thickness, wherein the leading surface is configured to interface with a rear portion of a cartridge, and wherein the thickness spaces the leading surface from the surface of the bolt assembly;
• and
• an extension coupling the body to the bolt assembly, the extension defining a second bore adjacent to, and sharing a common axis with, the first bore, wherein the first bore and the second bore receive the firing pin.

A method of accommodating firing different lengths of cartridges with a single firearm, comprising:

• provide a firearm configured to fire a first cartridge of a first length;
• manipulating an adjuster assembly to accommodate firing a second cartridge of a second length, wherein manipulating the adjuster assembly comprises:
• rotating an actuator to a position in which a hammer of the firearm is receivable by the actuator;
• rotating an adjuster within a threaded bore of the firearm;
• and
• translating a bolt assembly into a position whereby the second cartridge is fireable from the firearm;
• and
• discharging the firearm to fire the second cartridge.