Adjustable firearm balance weight system

An adjustable firearm balance weight system comprising:

• a balance weight configured to be secured within a part of a firearm in at least two alternative positions relative to the part of the firearm;
• and
• a lock system configured to engage 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,
• wherein the part of the firearm comprises an internal chamber configured to receive the balance weight to move relative to the part of the firearm along a sliding direction,
• wherein the internal chamber comprises a first region configured to surround a barrel of the firearm, and a second region adjacent to the first region and configured to slidingly receive the balance weight,
• wherein the first region and the second region are open to each other, and
• wherein the internal chamber comprises a narrowed region between the first region and the second region, and the narrowed region is configured to prevent the balance weight from moving from the second region to the first region.

An adjustable firearm balance weight system comprising:

• a balance weight configured to be secured within a part of a firearm in at least two alternative positions relative to the part of the firearm;
• and
• a lock system configured to engage 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, wherein:
• the balance weight configured to slide between the two positions;
• and
• the lock system comprises:
• lock mounted to the part of the firearm,
• wherein the lock is movable without the use of a tool from a first position in which the lock engages the weight, and a second position in which the lock does not engage the weight.

An adjustable firearm balance weight system comprising:

• a balance weight configured to be secured within a part of a firearm in at least two alternative positions relative to the part of the firearm;
• and
• a lock system configured to secure engage 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,
• 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, and
• wherein the first protrusion is mounted on a first lever having a first button that is movable towards the balance weight to move the first protrusion to the respective second position, and the second protrusion is mounted on a second lever having a second button that is movable towards the balance weight to move the second protrusion to the respective second position.