Manufactured in 1910 as an octagon receiver Imperial Russian Nagant, this rifle has been outfitted for performing pressure testing of service cartridges. A thick steel collar is installed over the chamber, with a port drilled into the barrel and a threaded opening that can accept either a solid plug or a pistol apparatus (both included). The plug completely blocks the port for conventional firing, and the piston apparatus redirects gas pressure from discharging cartridges to crush copper cylinders (eleven included). The deformation of copper under pressure was a known variable, and test rigs on similar principles were used by multiple military forces. Blade front and folding ladder rear sights, matching numbers on the ring and plug, and a smooth straight wrist stock dated "1910" and fitted with a brown leather sling.

Very fine, with 85% of the original blue finish, showing areas of brown patina, as well as mild handling marks, edge wear and spotting. The stock is also very fine, with some scratches and dents. Mechanically excellent.