Patent ID: 7677150

Claim:
A facility for connection to a firearm with a muzzle extending to define a forward direction, the muzzle having an enlarged end portion having a first diameter larger than a second diameter corresponding to a barrel portion adjacent to the enlarged end portion, the facility comprising: a body having an axis; the body having a bore centered on the axis; the body having a gate passage; a gate element received in the gate passage for movement along a gate path perpendicular to the axis; the gate element being operable for movement between a closed position preventing extraction of the end portion from the bore and an open position enabling extraction of the end portion from the bore; the gate element being a planar body having a first face and an opposed second face; the gate element having spaced apart arms with free ends defining a gap therebetween; the gap having a width smaller than the first diameter and larger than the second diameter, such that the barrel portion may pass through the gap, and at least a portion of the enlarged end portion may not pass through the gap; the first face defining a recessed area sized to receive a rear portion of the enlarged end portion of the muzzle when the gate element is in the closed position; the recessed area defining a recess plane below the first face, the recessed area being bounded by a shoulder; the gate element having opposed shoulder portions, each positioned at a free end of the gate element, each protruding above the recess plane, and spaced apart by a distance less than the first diameter, such that the shoulder portions are operable to engage the enlarged end portion to prevent movement of the gate element to the open position, when a rear portion of the enlarged end portion of the muzzle is received in the recessed area.