Patent ID: 7752796

Claim:
A locking device for a firearm, the locking device comprising: a generally cylindrical locking round operable to be chambered into a firing chamber of the firearm, the locking round comprising: a flange extending radially outward from a first end of the locking round, wherein the flange is operable to engage a shoulder of a firing chamber of the firearm; a plurality of prongs generally defined by: an internal axial bore extending from the second end of the locking round toward the first end thereof to an intermediate point defined along an axial length of the locking round between the first end and second end, wherein a radius of the internal axial bore uniformly decreases from the second end of the locking round to the intermediate point, therein generally defining a bevel in the plurality of prongs, and a plurality of slits radially spaced about the locking round, the plurality of slits generally extending from the second end of the locking round to the intermediate point, wherein the plurality of slits terminate at the intermediate point; and an internal thread extending axially from the intermediate point toward the first end of the locking round; an elongate locking rod having a first end and a second end, the locking rod comprising: a generally conical cam associated with the first end of the locking rod, the cam being defined by a first radius and a second radius, wherein the first radius is smaller than the second radius; an external thread extending axially from the first radius of the cam to the first end of the locking rod, wherein the external thread is operable to threadingly engage the internal thread of the locking round; and a first engagement member associated with the second end of the locking rod, wherein an axial rotation of the first engagement member is operable rotate and linearly translate the cam based on an engagement between the internal thread and external thread, therein radially translating the plurality of prongs and selectively engaging the plurality of prongs with a bore of the firing chamber; and a generally hollow protective cylinder having a first end and a second end, wherein the first end of the protective cylinder is rotatably coupled to the locking rod proximate to the second end of the locking rod, wherein the first engagement member is generally encircled by the protective cylinder, and wherein the second end of the protective cylinder has a generally hollow and conical flare extending radially outward therefrom, wherein the conical flare is operable to selectively engage an internal portion of a muzzle of the firearm.