I great promo video of the US military M2A2 machine gun a great idea of US soldiers on the battlefield. The U.S. Ordnance M2A2 machine gun is an air-cooled, belt-fed machine gun that fires from a closed bolt and operates on the short recoil principle with fixed headspace and timing. It is capable of both sustained automatic and accurate single-shot fire. It can be mounted on a vehicle, boat, helicopter or other aircraft. Ammunition may be fed from either the left or right side of the gun, making it suitable for use by both infantry and in armored vehicles. The M2A2 weapon system has been tested to well over 50,000 rounds. Its single-breech lock system allows for field rebuild, eliminating the need for depot-level maintenance during its lifetime and thereby greatly reducing logistical support. U.S. Ordnance developed its M2A2 12.7mm weapon after years of experience manufacturing machine guns for the U.S. Department of Defense and U.S. Foreign Allies. Its M2A2 offers the proven performance of the existing M2HB machine gun but also features fixed headspace and timing. This upgrade improves the performance of the battle-proven M2HB weapon system, largely increases the safety level for operating personnel and affords barrel changing on crew-served or coaxial-mounted weapons in 10 or fewer seconds. Only one person needs to change the M2A2 barrel, thereby reducing exposure to enemy fire and quickly readying the weapon for continued operation. The U.S. Ordnance M2A2 system utilizes the standard barrel thread, which means standard M2HB barrels can be used in the A2 gun as needed, in emergencies or training. (Using the standard M2HB barrel in a QCB weapon requires removing the Barrel Support Locating Pin, then headspacing the barrel using the standard headspace and timing gage.) Using only the A2 conversion kit, an armorer at the customer location can convert an M2HB machine gun into a U.S. Ordnance M2A2 weapon system in fewer than 30 minutes, without complex tools or machines. Fixed headspace and timing eliminate safety concerns associated with barrel changing and improper timing Common barrel thread interchanges with existing M2HB barrels, and non-QCB parts are interchangeable with M2HB machine guns, which eliminate logistics concerns during fielding Improved barrel handle simplifies hot-barrel changing with better barrel alignment, and the retention system assures the barrel is securely locked and aligned Can be fitted to all types of armored, light and heavy vehicles; patrol boats; helicopters; and other aircraft Fires all types of NATO ammunition: Ball, Tracer, AP, API, APIT, AP Hardcore and Multipurpose Sustained automatic or single-shot firing from the closed bolt for single-shot accuracy Simple, durable and rugged design for easy maintenance and conversion capacity from left hand to right hand feed Various mounting applications, for manual or solenoid firing A machine gun is a fully automatic mounted or portable firearm, usually designed to fire bullets in quick succession from an ammunition belt or magazine, typically at a rate of three to eighteen hundred rounds per minute. Fully automatic weapons are generally categorized as submachine guns, machine guns, or autocannons. Submachine guns are hand-held automatic weapons for personal defense or short-range combat firing pistol-caliber rounds. A machine gun is often portable to a certain degree, but is generally used when attached to a mount or fired from the ground on a bipod or tripod, and generally fires a rifle cartridge and is capable of sustained fire. Light machine guns are small enough to be fired hand-held, but are more effective when fired from a prone position. The difference between machine guns and autocannons is based on caliber, with autocannons using calibers larger than 16 mm.,[1] and whether the gun fires conventional bullets or explosive rounds. Guns firing large-caliber explosive rounds are generally considered either autocannons or automatic grenade launchers ("grenade machine guns"). In contrast to submachine guns and autocannons, machine guns (like rifles) tend to have a very high ratio of barrel length to caliber (a long barrel for a small caliber); indeed, a true machine gun is essentially a fully automatic rifle, and often the primary criterion for a machine gun as opposed to an automatic rifle is the presence of a quick-change barrel or other cooling system. Automatic rifles and (more commonly) assault rifles may be capable of fully automatic fire, but are not designed for sustained fire. In United States gun law, machine gun is a technical term for any fully automatic firearm, and also for any component or part that will modify an existing firearm such that it functions as a fully automatic firearm.[2] Overview of modern automatic machine guns Unlike semi-automatic firearms, which require one trigger pull per round fired, a machine gun is designed to fire for as long as the trigger is held down.

• published: 02 Jan 2015
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