Question: The Rieder Automatic Rifle was a model made by the company that created firearms for the forces of what country?
Related documents: [0]  [DOC] The Rieder Automatic Rifle was a fully automatic Lee–Enfield SMLE rifle conversion of South African origin. The Rieder device could be installed quickly with the use of simple tools. A similar weapon of New Zealand origin was the Charlton Automatic Rifle. [END] 
[1]  [DOC] The Lee–Enfield is a bolt-action, magazine-fed, repeating rifle that was the main firearm used by the military forces of the British Empire and Commonwealth during the first half of the 20th century. It was the British Army's standard rifle from its official adoption in 1895 until 1957. . It is often referred to as the "SMLE," which is short for the common "Short Magazine Lee-Enfield" variant. [END] 
Answer: 
British Empire and Commonwealth
British Empire and Commonwealth