The M14 replaced the M1 Garand as the standard US service rifle, adding a detachable box magazine and selective-fire capability. The M14 was quickly replaced by the M16 in Vietnam, where its full-power cartridge and large size proved problematic in jungle combat. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 7.62x51mm Capacity: 20 Year introduced: 1957, USA Weight: 8.7 oz Overall length: 44.3" Status: Discontinued Military use: Yes Intended use: Military, Service Rifle, Collector