Good story and link on the Lee Enfield Jungle Carbine
An Official Journal Of The NRA | Lee-Enfield No. 5 'Jungle Carbine:' An Exploded View
During World War II, the British military concluded that they needed a rifle shorter and lighter than the standard-issue No. 4. Thus was born the No. 5 "Jungle Carbine."
www.americanrifleman.org