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What Is That "bump" On The Barrel?


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It's used to dissipate gasses as they travel down the tube. The bump you see covers a section of barrel that has several ports. The main thing I remember about them was that they were a pain in the butt to clean.

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"Bore evacuators are ejector pumps mounted on cannon to remove propellant gases from the barrel after firing. The bore evacuator contains a reservoir which is charged by high pressure propellant gas during the projectile's transit down the gun bore. After the projectile exits the muzzle, the pressure in the bore decreases to nearly ambient. The high pressure gas in the reservoir then flows through angled ejector nozzles, inducing a flow through the breech end of the gun and clearing the bore. It is highly desirable to improve the effectiveness of the gun bore evacuator. Increased evacuator pumping action will result in reduced flareback potential and greater crew safety."

http://www.eng.rpi.edu/mane/lightcraft/Res...escription.html

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