An automatic firearm, a barrel usable with an automatic firearm and a shot counter for mounting to a barrel of an automatic firearm. The shot counter is configured to track the number of shots fired through the barrel and to provide an indication of the remaining lifespan of the barrel.

Disclosed is an inspection and measurement system for hollow cylindrical objects (100) such as internal gun barrel surface of large caliber gun barrels (150). The system (100) comprises an inspection device (200,500) operatively connected to the controller (400). The controller (400) is configured to receive realtime 2D image and 3D laser scan data captured by the inspection device (200,500) to generate 2D and 3D maps of the internal surface of the hollow cylindrical object and provide a means of visualization and interpretation of inspection and measurement data.

Disclosed is an inspection and measurement system for hollow cylindrical objects (100) such as internal gun barrel surface of large caliber gun barrels (150). The system (100) comprises an inspection device (200,500) operatively connected to the controller (400). The controller (400) is configured to receive realtime 2D image and 3D laser scan data captured by the inspection device (200,500) to generate 2D and 3D maps of the internal surface of the hollow cylindrical object and provide a means of visualization and interpretation of inspection and measurement data.

A ballistic test barrel system includes a fixture, a chamber in the fixture, a barrel extending from the chamber, and an observation window in or on the chamber.

A ballistic test barrel system includes a fixture, a chamber in the fixture, a barrel extending from the chamber, and an observation window in or on the chamber.