M14

The M14 is a 7.62mm caliber automatic rifle. It is essentially a modernized M1 Garand, capable of automatic fire, using a detachable magazine, and chambered in the 7.62x51mm round. The M14, designed for use by the United States Armed Forces, first saw action in the Vietnam war. However, due to the weapon's unwieldy nature in the jungle and the high recoil on fully automatic, it was replaced by the smaller caliber and lightweight M16. The M14, however, is still in service. The M14 and M1 Garand are both used in a ceremonial role in the United States military. M14 rifles modified for accuracy are produced as M21 Designated Marksman's Rifles for the United States Marine Corps. There has also been a modernization of the M14 based on experiences in Afghanistan and Iraq, known as the Enhanced Battle Rifle (EBR).

The United States military currently fields M14s produced by Smith Enterprise in SDM roles.

In Call of Duty 4 Multiplayer
The M14 cannot be obtained in the Call of Duty 4 single player campaign. In multiplayer, the M14 is a modernized model, with a Picatinny rail, and a more modern finish than its wooden-stocked ancestor. The M14 is a semi-automatic rifle favored by some for its long range power. Attachments include the ACOG scope, the Grenade Launcher, the Red Dot sight and the Suppressor. The M14 is a true 'love it or hate it' weapon, loved by many players, because it can drop a person in two hits to the body (in hardcore mode, it can kill someone in one hit), but hated by others for its high recoil. It makes an excellent mid-range rifle or ambush weapon, although it suffers from high recoil at long range. It is also a good weapon for scoring headshots with, because it is one of the only weapons which will kill with one headshot 100% of the time.

The M14 is similar to the G3 in Hardcore mode in that it is a popular weapon, due to the fact that it can drop any non-Juggernaut using player in one shot.