Patent ID: 8534181

Claim:
A self-loading firearm, having a front from which a bullet exits when fired, and comprising: (a) a unitary portion, including a human interface and a barrel; (b) a moveable portion attached to said unitary portion so as to permit said moveable portion to move relative to said unitary portion, said moveable portion including at least a portion of a firing chamber; (c) a lock adapted to selectably fix in place said moveable portion relative to said unitary portion; (d) a recess defined by said unitary portion; and (e) an inertial member permitted to move inside said recess and urged into a first position in which said lock is maintained in a position fixing in place said moveable portion relative to said unitary portion, said inertial member adapted to translate into a second position displaced toward said front of said firearm from said first position by at least 0.1 cm, upon firing of said firearm, in which said second position said inertial member begins to change the position of said lock, thereby permitting said moveable portion to move relative to said unitary portion, after said lock has been moved sufficiently to unlock said moveable portion from said unitary portion.