Douglas Harper's Etymology Dictionary
1902, named for J.P. Lee (1831-1904), U.S. designer of bolt action + Enfield (q.v.).
Wikipedia
The Lee–Enfield bolt-action, magazine-fed, repeating rifle 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.
A redesign of the Lee–Metford (adopted by the British Army in 1888), the Lee–Enfield superseded the earlier Martini–Henry, Martini–Enfield, and Lee–Metford rifles. It featured a ten-round box magazine which was loaded with the .303 British cartridge manually from the top, either one round at a time or by means of five-round chargers. The Lee–Enfield was the standard issue weapon to rifle companies of the British Army and other Commonwealth nations in both the First and Second World Wars (these Commonwealth nations included Australia, New Zealand, Canada, India and South Africa, among others). Although officially replaced in the UK with the L1A1 SLR in 1957, it remained in widespread British service until the early/mid-1960s and the 7.62 mm L42 sniper variant remained in service until the 1990s. As a standard-issue infantry rifle, it is still found in service in the armed forces of some Commonwealth nations, notably with the Bangladesh Police, which makes it the second longest-serving military bolt-action rifle still in official service, after the Mosin Nagant. The Canadian Forces' Rangers Arctic reserve unit still used Enfield No.4 rifles , with plans announced to replace the weapons sometime in 2014 or 2015. Total production of all Lee–Enfields is estimated at over 17 million rifles.
The Lee–Enfield takes its name from the designer of the rifle's bolt system— James Paris Lee—and the factory in which it was designed—the Royal Small Arms Factory in Enfield. In Australia, Canada, New Zealand, Southern Africa and India the rifle became known simply as the "three-oh-three" or the "three-naught-three".
Usage examples of "lee-enfield".
He was wearing a loincloth, a bone in his nose, and a web cartridge belt around his neck, and he was carrying a British Lee-Enfield MK III.
Fergus spoke to one of them in a whisper and he pointed down into the misty hollow, then spat and worked a round into the breech of the Lee-Enfield rifle which was propped on the windowsill.
He also added the Lee-Enfield rifle to the top of one load, being careful to strap it tight.
Jan Cheroot dashed into the yard, panting from his run, carrying the Lee-Enfield rifle at high port across his chest, sweat streaking down from under his brimless pillbox infantry cap and his face crumpling with dismay as he saw Zouga's bloody torn face.