Lee Enfield 303

The Lee–Enfield is a bolt-action, magazine-fed repeating rifle that served as 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. The WWI versions are often referred to as the "SMLE", which is short for the common "Short Magazine Lee–Enfield" variant.

(Bron Wikipedia: https://en.wikipedia.org/wiki/Lee%E2%80%93Enfield)