Brass catcher
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Casing after it is ejected from the firearm.
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Carl Gustav m/45B submachine gun with a brass catcher.
A brass catcher (also brass trap) is a device designed to capture cartridge casings, often made of brass, as they are ejected from a semi-automatic firearm. Various designs exist, utilizing a bag, pouch, net or box to catch the casings. Some brass catchers, whether universal or designed for a specific gun, can be attached directly to the firearm. Other, often larger, free-standing brass catchers may be placed to the side of the firearm.[1]
References
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