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The SockelFlak started life as defensive armament for Zeppelin airships against fighter attack. However, once defenders discovered that airships filled with hydrogen were vulnerable to machine guns firing tracer ammunition Zeppelin losses mounted and the Germans switched to less vulnerable bomber aircraft.
The 14.5×114mm (.57 calibre) is a heavy machine gun and anti-materiel rifle cartridge used by the Soviet Union, the former Warsaw Pact, modern Russia, and other countries.. It was originally developed for the PTRS and PTRD anti-tank rifles, and was later used as the basis for the KPV heavy machine gun that formed the basis of the ZPU series anti-aircraft guns that is also the main armament of ...
These barrels were designed to take advantage of the new Mk 262 cartridge, which uses a 77-grain (5 g) bullet. Some early Mod H's were made using Noveske barrels but eventually switched back to the Douglas barrels commonly shared across the other variants. [9]
During this war, William Brophy, a US Army Ordnance officer, mounted a .50 BMG (12.7 mm) barrel to a captured PTRD to examine the effectiveness of long-range shooting. Furthermore, the US also captured a number of PTRDs in the Vietnam War.
Istiglal Ist-14.5 ; Type: Anti-materiel rifle: Place of origin: Azerbaijan: Service history; In service: 2008–present: Used by: See Users: Production history; Designer
The Close Quarter Battle Receiver (CQBR) [5] is a replacement upper receiver for the M4A1 carbine developed by the US Navy.. The CQBR features a 10.3 in (262 mm) length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the weapon significantly more compact, thus making it easier to use in, and around, vehicles and in tight, confined spaces.
Each barrel has a maximum rate of fire of around 600 rounds per minute, though this is practically limited to about 150 rounds per minute. The quad-barrel ZPU-4 uses a four-wheel carriage similar to that once used by the obsolete 25 mm automatic anti-aircraft gun M1940. In firing position, the weapon is lowered onto firing jacks.
Arguably, the criticisms about range, accuracy, and lethality are related to the change in barrel length and twist between the M16 and M4. The earlier 5.56 rounds (the original M193) were optimized for a 20-inch (51 cm) barrel with a 1:12 twist. In 1980 STANAG 4172 defined the 5.56×45mm NATO chambering and its accompanying 1:7 twist rifling. [38]