Patent ID: 6895707

Claim:
A system for locking a firearm, the system comprising: a barrel rod comprising a pair of pins configured to protrude outward from a longitudinal axis of the barrel rod, wherein the barrel rod is rigid and is longer than a barrel of the firearm and is of sufficient length to protrude from the barrel of the firearm; and a firing chamber plug sized to fit within a firing chamber of the firearm and configured to removably engage the pair of pins of the barrel rod, wherein the firing chamber plug comprises: a hole for receiving an end of the barrel rod; a spring compressed by the end of the barrel rod; a first pair of grooves for receiving the pair of pins and for guiding the pair of pins longitudinally along the firing chamber plug; a second pair of grooves connected transversely to the first pair of grooves for guiding the pair of pins transversely as the barrel rod turns; and a third pair of grooves connected to the second pair of grooves for seating the pair of pins after the spring pushes the pair of pins into the third pair of grooves, wherein the third pair of grooves is configured to prevent the barrel rod from turning.