The Rexer rifle was a British prototype self-loading rifle designed by the Rexer Manufacturing Company.
The Rexer rifle was developed in the early 1900s by Rexer Manufacturing Company, a British manufacturer that produced Madsen guns under license from the Danish patent holder, Dansk Rekylriffel Syndikat. The rifle was publicly demonstrated at Bisley in 1904, where it was compared to a rival design, the Hallé rifle. The British Army Automatic Rifle Committee investigated both weapons in 1906 and considered the Rexer to be the superior weapon, but criticized its build quality and considered it to be too fragile for military service.
Further development of the design was brought to an abrupt halt when the Dansk Rekylriffel Syndikat filed a lawsuit against Rexer, claiming the rifle had infringed their patents. The court case ended in favor of the Danish company and Rexer was bankrupted; consequently, the rifle was abandoned.
The Rexer was a recoil-operated self-loading rifle of a relatively conventional design. The bolt was locked into the breech by a pair of lugs which were released upon firing. The recoil forced the bolt backwards, allowing the spent cartridge to eject and a new round to chamber. The return spring would then push the bolt back towards the breech.
The Rexer was offered in 6.5×55mm Krag, .303 British, and 7×57mm Mauser. It fed from an internal 5-round box magazine.