Which term is the device that directs escaping gases to exit the bore?

• A. Hull
• B. Muzzle break
• C. Bore evacuator
• D. Glacis plate

Answer: (C)

The device that directs escaping gases to exit the bore is a bore evacuator. It’s built into the barrel and uses the pressure of the fired propellant gases to pull air through the bore and vent those gases out, preventing them from lingering in the barrel or blowing back toward the crew. This keeps the bore cleaner and reduces fumes reaching the vehicle interior, which can affect safety and accuracy.

Hull refers to the vehicle’s main body, which isn’t involved in directing bore gases. A muzzle brake redirects gases at the muzzle to counter recoil, not to evacuate the bore. A glacis plate is armor on the front of the vehicle.