British No.1 Mk. III

  Nation: Great Britain
  Adopted: 1907
  Design: Lee-Enfield
  Caliber:  .303 British
  Capacity: 10 shot
  Action: Bolt action
 

Mfg. by: Royal Small Arms Factory, Enfield Lock, Middleaex

Adopted in 1907, saw action in WWI and WWII.  Still a viable military weapon after WWII, as evidenced by  examples, rebuilt and placed in reserves at least as late as 1972.