The M1 Carbine was developed in 1941, to complement the standard Issue M1 Garand. Lightweight and easy to carry and use, it replaced pistols for other than Infantrymen, who
required the more powerful M1. It was a popular weapon in WWII and early in Korea, until the M2 Carbine select-fire upgrade became available.
M1 with bayonet lug and adjustable rear sight
The M1 version with bayonet lug and adjustable windage rear sight was deployed in the Korean War until mostly replaced by the M2.
About 5,510,000 M1 carbines, 150,000 M1A1 carbines, 570,000 M2 carbines, and 2100 M3 carbines were manufactured.