The Bren gun, adopted by the British army in 1935, takes the first part of its name from the city of Brno, which is now in which country?

Brno is the second largest city in the Czech Republic by population and area, the largest Moravian city, and the historical capital city of the Margraviate of Moravia.

The British Army adopted the Czechoslovak ZB vz.26 light machine gun manufactured in Brno in 1935, although a slightly modified model, the ZB vz. 27, rather than the ZB vz. 26 which had been submitted for the trials. The design was modified to British requirements under new designation ZGB 33, which was then licensed for British manufacture under the Bren name.

The major changes were in the magazine and barrel and the lower pistol grip assembly which went from a swiveling grip frame pivoted on the front of the trigger guard to a sliding grip frame which included the forward tripod mount and sliding ejection port cover. The magazine was curved in order to feed the rimmed .303 SAA ("Small Arms Ammunition") cartridge, a change from the various rimless Mauser-design cartridges such as the 8mm Mauser round previously used by Czech designs.