The BREN is a clip-fed submachine gun developed in Czechoslovakia in the 1930s. It was used by the British Army during World War II and was known for its reliability and accuracy. The BREN was a gas-operated, air-cooled, magazine-fed weapon that fired from an open bolt. It was capable of firing up to 500 rounds per minute and had a range of up to 600 yards. The BREN was used by many Allied forces during the war and was highly regarded for its effectiveness.