The three major variants of the Carbine: the WW2-era M1, the folding-stock M1A1, and the full-auto capable M2.
m1 carbine
An American semi-automatic carbine, chambered for the proprietary .30 Carbine intermediate cartridge. Adopted in 1942, the M1 Carbine was the most-produced US small arm of World War II, and was used on all fronts of that war, through the Korean War and into the Vietnam War.
Its distinguishing features are the two pins on the upper stock just forward of the bolt. WWII-era Carbines had a 15-round box magazine, a clean barrel from the stock to the muzzle and simple flip-tab rear sights. Later versions added a bayonet lug and more advanced graduated rear sights, as well as a 30-round curved magazine and the ability to fire on full-automatic. A wire-frame folding stock was also developed for use by paratroopers.
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This tag implicates rifle (learn more).

