A brass catcher (also brass trap) is a device designed to capture cartridge casings, often made of brass, as they are ejected from a 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 larger, free-standing brass catchers may be placed to the side of the firearm.^[1]

This article relies largely or entirely on a single source. (October 2017)

• Casing after it is ejected from the firearm
• AR-15 with aftermarket brass catcher
• Carl Gustaf m/45B submachine gun with a brass catcher