Officially: "U.S. Rifle 7.62mm M14 Operation and Cycle of Function” U.S. Army TF92970. This was produced by the U.S. Army in 1960, documenting the operation and function of the Caliber 7.62mm M14 rifle. It includes design and capabilities, as well as, field stripping provisions, cycle of functioning: chambering, locking, firing and both automatic and semiautomatic operation.

The M14 rifle was originally designed as the natural successor to WWII's formidable M1 Garand rifle. Numerous prototypes were developed over many years, with the key ideas being to use a smaller, but similarly powerful .30 caliber cartridge and introduce a bottom fed removable 20 round box magazine. It was eventually finalized to use the standard NATO 7.62x51mm round, and upon selection by the U.S. Armed Forces in 1957, was issued and used by both the US Army and Marines from 1959 1970. Over 1.5 million have been produced.

The weapon was battle tested in the jungles of Vietnam, but it wood stock was found to be unsuited to the high humidity and moisture. Envisioned as a weapon that could replace the Garand rifle, M1 Carbine, B.A.R., and Grease gun SMG, and thus standardize supply logistics was not to be. Procurement ended in 1963, and in 1964 the U.S. Army began to transition to the M16 rifle as it's standard issue rifle. The M14 would still remain in certain designated niches for occasion sniper usage. The USMC began using a accurized version (the Designated Marksman Rifle) and further resurgence of the M14, often as the M21 or M25 sniper system, would take place in the Afghanistan and Iraq wars, mainly due to the longer desert distances at which the enemy was often engaged at.

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