Abstract: The present invention relates to firearms. In some cases, the firearms include a firing pin; a first ignition chamber that is configured to house a round of ammunition and to move proximally with respect to the firing pin so that when the round is in the first chamber and the firearm is fired, a portion of the round is struck against the firing pin. In some cases, the firearms also include a follower configured to be movable proximally and distally within the firearm and to be biased against a primer or proximal end of the round such that the follower is configured to selectively hold the round within the first chamber as the first chamber moves proximally, and such that proximal movement of the follower stops when the round strikes the firing pin, so that the follower acts as a bolt face for the round. Other implementations are also described.

Abstract: A customizable firearm is disclosed. The firearm can perform one or more functions, including firing a bullet, firing a less-than-lethal projectile, and/or providing light. In some cases, the firearm includes a main frame component having an inner cavity, wherein a barrel is slidably received within the cavity so as to selectively slide back and forth within the cavity. In some cases, a proximal end of the barrel comprises a bullet chamber. In such cases, the barrel fires the bullet by carrying the bullet proximally and striking it against a stationary firing pin. In other cases, a firing pin is attached to a distal end of the barrel. In such cases, the barrel discharges the firearm by moving the firing pin distally and striking a cartridge at a distal end of the main frame. In some cases, the barrel rotates between a safe and a fire alignment. Other implementations are described.

Abstract: The present invention relates to systems and methods for making and using a firearm that includes an extendable light source that can be selectively moved closer to and farther from a longitudinal axis of a barrel of the firearm. In some cases, the light source includes a laser or a light bulb, such as an LED. By being able to selectively move closer to and farther from the barrel's longitudinal axis, the light source can be adjusted so that it is able to shine past one or more attachments that are placed on a distal end of the firearm. Other implementations are also described.