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 firearms-related article is a stub.