US Patent 9995556 Folding firearm and related methods

A firearm includes a receiver, a forearm pivotally attached to a distal end of the receiver, and a barrel having a barrel extension. A proximal end of the barrel and the barrel extension are secured within the forearm such that the barrel and barrel extension are pivotable with the forearm relative to the receiver between a first assembled position and a second folded position. The firearm further includes a locking mechanism for securing the forearm, barrel, and barrel extension to the receiver in the first assembled position. The forearm, barrel, and barrel extension may be secured to the receiver in the first assembled position for use of the firearm, after which the firearm may be folded for storage and/or transportation.