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Caliber:4.5×40R

M14 automatic rifleIsUnited States of AmericaSelectable shooting modes builtRifleIn the United States armed forces wereM16 automatic rifleReplaced.

Overview
World War II, the U.S. military are using the M1-type 7.62mm semi-automatic rifles Garland. As the quality of a larger rifle, magazine capacity of elastic volume (8 rounds) too small, so the U.S. military in 1944 and offered to replace it with a new gun. 1945 the United States to implement a "light rifle research program." The main requirements are: diameter 7.62mm, the total mass of not more than 4.1kg, magazine capacity of 20 rounds, with two tripods, rifle butts can be folded.
Throughout the development process, the United States Arsenal come up with several dozens of sample shots, there are some foreign gun also participated in the selection. The last remaining four kinds of gun rigorous selection trials: the U.S. Springfield Arms Company T65-style bullet developed for the launch of the T44-like guns, the British Enfield arsenal developed by EM2-like guns, Belgium FN FAL automatic rifles(Named T48). Test result, T48 rifle ranked first Springfield rifle weapons of the company's T44 in second place. T44 rifle is a well-known firearms designer Yuehan Kan ears Garland Garland in the M1-type rifle started designing on the basis ofAutomatic Rifle. May 1, 1957, the U.S. Army announced the formal adoption of T44 rifle. The U.S. military stereotypes named M14 rifle, Springfield Armory in 1958 put into operation. M14 rifles became the standard military equipment, used in place ofM1 rifle-type Garland,M1 Carbine,M1918 Browning automatic rifle-type.
M14 rifle firing 7.62 × 51mm T65 shells (shell-style Garland than the M1 rifle used .30-06 rifle bullet shortened by 12 mm). The U.S. military has always emphasized the design of military rifles, long range thinking, the U.S. military did not acceptIntermediate power cartridge.NATOGeneralized to ammunition selection, the United States firmly opposed to any reduction in the power range of ammunition, and exert influence, 1953, NATO has opted to 7.62 × 51 Haomi as a standard rifle bullet shells. M14 rifle using 7.62 × 51 Hao MiNATOStandard rifle rounds of ammunition and rifles to achieve standardization, simplifying theLogistics供应.
M14 is basically developed on the basis of M1 rifles, the rifle there are two models, one M14 rifle, choose semi-automatic or fully automatic shooting, more special is generally a fixed speed machines in the semi-automatic firing mode locked, conversion fully automatic shooting mode requires facelift speed machine handle. First, heavy barrel to a single hair, bursts of fire with automatic weapons classes. Originally planned to develop M15 rifles.In 1959, M15 rifle program was abandoned, M14 rifle after the formal shape was improved, and there M14E1 and M14E2-style-type models, M14E2 rifle was officially adopted in 1968 and was named M14A1-style 7.62mm rifle. M14A1 rifle in the M14 rifle as part of the installation of speed machine handles instead of the speed machine locks. The implementation of a single hair, bursts of fire, and to install two tripods. Develop into a M14A1. M14A1 rifle from the exterior view with the main difference between M14 rifles are: straight butt, after the trigger grip, folding front grip, and two tripods. Rifle is also equipped with a rubber cushion and hinged butt plate; gun equipped with a muzzle stabilizer bursts may effectively control the gun jumped on it.
　　M14 rifle untimely, the 20th century 60 years the United States to interveneVietnam War, Jungle warfare in Southeast Asia, M14 rifle seemed more bulky man carrying a limited amount of ammunition, and ammunition is too large, when the automatic fireSpreadSurface too difficult to control accuracy. Than the use of intermediate power of firearms and ammunitionAK-47 assault rifle. In fact, most of the troops allotted to the M14's speed machines have been locked in semi-automatic mode forces to avoid the automatic firing pointless waste of ammunition. M14 rifles, military rifles in the past emphasized that the design idea --AccuracyAndRange, But it seemed too long, leading to M14 rifle combat in the jungle in Southeast Asia, very inconvenient.
January 23, 1963, the U.S. Department of Defense ordered the termination of the procurement M14 rifles, M14 rifles discontinued. Until the cut-off before the rifle produced a total of 1.4 million, of which 167,000 Springfield Armory sticks Harrington - Richardson Arms Company 537,582 sticks, Thompson - Ramo - Wooldridge's 319,182 sticks, Olin - Ma Sisson's Winchester - Weston Arms Branch 350,501 sticks. 1967, chose the M16-type 5.56mm small caliber rifle to replace the M14 rifle, M14 begun to withdraw equipment, which led to the historic Springfield Armory closed. A considerable number of M14 rifles, according to the military assistance program handed over to foreign troops. Besides the U.S., South Korea, China Taiwan also equipped with this gun. U.S. M14 is still used for training and guard.
　　
M14 rifle with high accuracy and long range advantages, 1969, the U.S. military has developed under the M14M21 sniper rifleBy the troops. In 2003, the U.S. military in Afghanistan, Iraq, war, re-enable the more coupled with bipod and sight of the M14, attacks on open ground, objectives, provide long-range support fire. Through the modern design of the M14 rifle and equipment of the army to re-commissioning.
Although the M14 rifle as a rifle can not be considered a military success, but in the civilian market has good sales, many plants continue to produce civilian-type M14 rifles for sale.

M14 automatic rifle Specification
Type: Automatic Rifle
Production period: 1958 -1964 years
Variant gun: M14A1, M21, M25
Yield: About 1.38 million
Diameter: 7.62 mm
Ammunition: 7.62 × 51mm NATO standard rifle bullet
Magazine Capacity: 20 rounds magazine
Bolt: Introduction air type, rotary locking bolt
Length: 1118 millimeters
Barrel Length: 559 mm
Weight: 4.5 kg
Firing rate: 700 ~ 750 rounds / min
　　Velocity: 850 m / s
　　Effective range: 700 m
Recoil can be 17.3J
Muzzle kinetic energy of 3567J