| Browning .50 op drievoetaffuit M3 | ||
| Type | Machinegeweer | |
|---|---|---|
| Land van oorsprong | ||
| Productiegeschiedenis | ||
| Ontwerper | John Browning | |
| Ontworpen | 1918 | |
| Fabrikant | General Dynamics, Fabrique Nationale de Herstal (FN) | |
| Eigenschappen | ||
| Kaliber | .50 inch, 12,7 mm | |
| Vuursnelheid | 450-550 schoten/min | |
| Mondingssnelheid | 910 m/s | |
| Maximale bereik | 6700 m | |
| Effectief bereik | 1800 m | |
| Massa (niet geladen) | 38,15 kg | |
| Lengte | 1654 mm | |
| Loop | 1143 mm | |
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With assistance from firearms engineers at Fabrique Nationale de Herstal, Belgium, the Model 1919 was completely re-engineered into the .30 caliber AN/M2 (Army-Navy) aircraft machine gun (not to be confused with the .50 caliber AN/M2 or the 20mm AN/M2, the two other primary US aircraft weapons of WWII). The .30 in M2/AN Browning was widely adopted as both a fixed (offensive) and flexible (defensive) weapon on aircraft. Aircraft machine guns required light weight, firepower, and reliability, and achieving all three goals proved a difficult challenge, with the mandate for a closed bolt firing cycle to enable the gun to be safely and properly synchronized for fixed-mount, forward-aimed guns firing through a spinning propeller, a necessity on many single-engined fighter aircraft designs through to nearly the end of World War II. The receiver walls and operating components of the M2 were made thinner and lighter, and with air cooling provided by the speed of the aircraft, designers were able to reduce the barrel's weight and profile. As a result, the M2 weighed two-thirds that of the 1919A4, and the lightened mechanism gave it a rate of fire approaching 1,200 rpm (some variants could achieve 1,500 rpm), a necessity for engaging fast-moving aircraft. The M2's feed mechanism had to lift its own loaded belt out of the ammunition box and feed it into the gun, equivalent to a weight of 11 lb (5 kg). In Ordnance circles, the .30 AN/M2 Browning had the reputation of being the most difficult-to-repair weapon in the entire US small arms inventory.
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The M2 also appeared in a twin-mount version which paired two M2 guns with opposing feed chutes in one unit for operation by a single gunner, with a combined rate of fire of 2,400 rpm. All of the various .30 M2 models saw service in the early stages of World War II,
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