Abstract: Embodiments of the present disclosure generally relate to bolt extraction systems and barrel extension systems for rifles, such as bolt-action rifles. In one or more embodiments, the bolt extraction system includes a bolt and a barrel extension which provide extraction cams and extraction lugs to utilize a screw action while assisting in the removal of the bolt head and a spent cartridge from the barrel extension. In other embodiments, the barrel extension system includes a barrel extension and a firearm receiver with a clamp assembly. The barrel extension has a threaded hole which aligns with an attachment hole disposed on the firearm receiver. A fastener couples the barrel extension to the firearm receiver via the attachment hole and the threaded hole.

Abstract: An adjustable support apparatus can include a first bracket, a second bracket, and a base coupled to the first bracket. The first and second brackets can be rotatable relative to the base and the second bracket can translate relative to the first bracket. In a first configuration, the first and second brackets can be adjacent one another to retain a device (e.g., a mount, a camera, binoculars, a firearm, etc.) to the adjustable support apparatus. In a second configuration, the first and second brackets can be rotated relative to the base and the second bracket can translate away from the first bracket to release the device from the adjustable support apparatus.