Adjustable firearm balance weight system

Abstract

An adjustable firearm balance weight system comprising: a balance weight configured to secure to a part of a firearm in at least two alternative positions relative to the part of the firearm; and a lock system configured to hold the balance weight in each of the at least two alternative positions relative to the part of the firearm, wherein the lock system is configured to be operated, preferably by hand and without tools, to allow the balance weight to move between the at least two alternative positions.

1 . An adjustable firearm balance weight system comprising:
 a balance weight configured to secure to a part of a firearm in at least two alternative positions relative to the part of the firearm; and   a lock system configured to hold the balance weight in each of the at least two alternative positions relative to the part of the firearm, wherein the lock system is configured to allow the balance weight to move between the at least two alternative positions.   
     
     
         2 . The adjustable firearm balance weight system of  claim 1 , wherein the lock system is configured to be operated by hand and without tools. 
     
     
         3 . The adjustable firearm balance weight system of  claim 1 , wherein the part of the firearm comprises a rifle forend, a rifle chassis or a rifle handguard. 
     
     
         4 . The adjustable firearm balance weight system of  claim 1 , wherein:
 The balance weight is attached to the part of the firearm to slide along a sliding axis within a passage defined by the part of the firearm, and comprises a plurality of first detents spaced along the sliding axis on a first face of the balance weight and a plurality of second detents spaced along the sliding axis on a second face of the balance weight; and   the lock system comprises:
 a first protrusion mounted to the part of the firearm on a first side of the passage and movable between a respective first position in which the first protrusion extends into the passage to engage a first detent, and a respective second position in which the first protrusion does not extend into the passage to engage the first detent; and 
 a second protrusion mounted to the part of the firearm on a second side of the passage and movable between a respective first position in which the second protrusion extends into the passage to engage a second detent, and a respective second position in which the second protrusion does not extend into the passage to engage the second detent. 
   
     
     
         5 . The adjustable firearm balance weight system of  claim 1 , wherein the first lock and the second lock are movable towards each other to move the first lock to the respective second position and the second lock to the respective second position. 
     
     
         6 . The adjustable firearm balance weight system of  claim 1 , wherein the balance weight is configured to secure externally to the part of the firearm. 
     
     
         7 . The adjustable firearm balance weight system of  claim 1 , wherein the part of the firearm comprises an accessory mount secured to a remainder of the firearm. 
     
     
         8 . An adjustable firearm balance weight system comprising:
 a balance weight configured to secure to a part of a firearm in at least one position relative to the part of the firearm by hand and without tools; and   a lock system configured to hold the balance weight in each of the at least one positions relative to the part of the firearm, wherein the lock system is configured to allow the balance weight to move removably from the at least one position.