Patent ID: 6871437

Claim:
A firearm comprising: a. a receiver; b. an action attached to the receiver; and c. an integral locking device attached to the receiver, wherein: d. the locking device can be actuated to interfere with a portion of the action, thereby preventing the firearm from being fired; the locking device can only be actuated when the action is in an open position; and the locking device cannot be accessed and/or defeated internally to the extent the firearm can be operatively disassembled when the locking device is actuated; and e. the locking device is a plunger lock comprising: a lock body attached to the receiver and having an axial bore; a lock plunger disposed in the axial bore and having a helical guide grove; a guide pin attached to the lock body, said guide pin having an end that lies within the helical guide groove; and a lock key configured to engage an end of the plunger accessible from the exterior of the firearm; wherein when the lock key is used to rotate the plunger, the helical guide groove of the plunger is forced to track along the guide pin attached to the lock body, causing the plunger to extend or retract.