Boresighter trainer for gun

Abstract

A boresighter/trainer fits into a distal end of a gun barrel and includes a sound sensor, a circuit, a laser, and a power source. The boresighter/trainer has at least two operational modes: one in which it continuously emits laser light and one in which it emits laser light for a short duration when the sound of a firing pin is detected. When in its first mode, the boresighter/trainer permits laser light to be projected along the longitudinal axis of a gun barrel in which it is portioned, for the purpose of aligning a sight on the firearm. When the boresighter/trainer is in its second mode and the firing pin of the gun is activated, the sound of the firing pin is detected by the sound sensor and activates a circuit in the boresighter/trainer to cause the light source to emit light along the longitudinal axis of the firearm barrel. The boresighter/trainer may have multiple bore adapters that fit different firearm bore diameters.

1 . A boresighter/trainer configured for use in a gun having a gun barrel with a first end having a firing chamber and a second end, the boresighter/trainer comprising: (a) a body having an axis, a proximal end, a distal end configured to be inserted into the second end of the gun barrel, and a seating portion between the proximal end and the distal end, the seating portion configured to form a first contact area with an inner surface of the gun barrel; (b) a bore adapter attached to the distal end, the bore adaptor having a variable adapter diameter and configured to form a second contact area with the inner surface of the gun barrel; (c) a light source in the housing to emit a light beam aligned with the body axis; (d) a power source, (e) a sensor to detect the sound of a firing pin strike of the gun, and to activate a circuit in response, wherein when the circuit is activated, the power source provides power to the light source and the light source emits light; and (f) a switch, wherein the switch has a first position in which the boresighter/trainer is in a first mode whereby it constantly emits light, and the switch has a second position 7  in which the boresighter/trainer is in a second mode whereby it emits light for a short duration when the sensor detects the sound of the firing pin strike. 
     
     
         2 . (canceled) 
     
     
         3 . The boresighter/trainer of  claim 1 , wherein the circuit includes a capacitor. 
     
     
         4 . The boresighter/trainer of  claim 1 , wherein the bore adapter includes deformable members defining the variable adapter diameter, wherein the deformable members deform in response to force applied by the fastener. 
     
     
         5 . The boresighter/trainer of  claim 1  wherein the power source is one or more batteries. 
     
     
         6 . The boresighter/trainer of  claim 5  that includes three batteries. 
     
     
         7 . The boresighter/trainer of  claim 1 , wherein the light source is a laser. 
     
     
         8 . The boresighter/trainer of  claim 7 , wherein the laser is activated for between about 7.5 to about 12.5 milliseconds, or about 0.1 seconds, when the circuit is activated. 
     
     
         9 . The boresighter/trainer of  claim 1 , wherein the circuit is a 4.5 V system. 
     
     
         10 . The boresighter/trainer of  claim 1  that is dimensioned to be received in either a 9 mm, .32 caliber, .38 caliber, .40 caliber, .44 caliber, .45 caliber or .50 caliber gun. 
     
     
         11 . The boresighter/trainer of  claim 1 , wherein the body has an surface with a first diameter at the proximal end and a second diameter less than the first diameter at the distal end, and wherein the seating portion is a tapered section of an outer surface of the body. 
     
     
         12 . The boresighter/trainer of  claim 1 , wherein the bore adapter diameter is variable. 
     
     
         13 . The boresighter/trainer of  claim 1 , wherein the body distal end is tapered and the bore adapter deforming members overly the distal end, and are configured to splay and move outward from the distal end when force is applied to them by the fastener. 
     
     
         14 . The boresighter/trainer of  claim 7  further comprising a switch to selectively connect the power source to the light source. 
     
     
         15 . The boresighter/trainer of  claim 1 , wherein the body includes a first cavity having an axis aligned with the body axis, and the first cavity houses the light source. 
     
     
         16 . The boresighter/trainer of  claim 15  that includes a second cavity adjacent the first cavity, wherein the switch and power source are in the second cavity. 
     
     
         17 . The boresighter/trainer of  claim 1 , wherein the proximal end of the body includes an opening from which the light source beam is projected. 
     
     
         18 . The boresighter/trainer of  claim 18 , wherein the switch has a third position, and when the switch is in its third position the boresighter/trainer is in a third mode in which it is off. 
     
     
         19 . The boresighter/trainer of  claim 1 , wherein the body is one piece. 
     
     
         20 . A kit comprising the boresighter/trainer of  claim 1  and one or more additional bore adaptors, wherein each of the one or more additional bore adaptors is configured to fit different-sized firearm barrels. 
     
     
         21 . The kit of  claim 20  that includes bore adaptors to fit firearms having the following bore sizes: 9 mm, .32 cal, .38 cal, .40 cal., .44 cal., .45 cal, or .50 cal. 
     
     
         22 . The boresighter/trainer of  claim 1  that further includes a fastener attaching the bore adapter to the distal end, the fastener configured to apply force to the bore adapter.