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Detail of 30 mm twin AA gun, vz.53/59. The M53/59 Praga is a Czechoslovak self-propelled anti-aircraft gun developed in the late 1950s. It consists of an armoured version of the Praga V3S six-wheel drive truck chassis, armed with a modified version of the M53 twin 30 mm (1.2 in) anti-aircraft gun mounted on the rear, which can be removed and used to provide ground support.
The M55 is lightly armored, 25 mm maximum, but sufficient to protect the crew from indirect artillery hits and small arms fire. The M53 has a 155mm gun, while the M55 uses the 203.2mm gun. [2] The M55 uses components of the M47 Patton tank, but the automotive aspects are reversed. The engine is mounted in the front and is driven through a front ...
The Zastava M55, also designated 20/3-mm-M55, is a Yugoslavian/Serbian 20mm triple-barreled automatic anti-aircraft gun developed in 1955 and produced by Crvena Zastava (now Zastava Arms company) in Kragujevac, Serbia, for Yugoslav People's Army use and also for the export market.
The Vz.53 complemented the towed 30mm Vz.53/59 and its self-propelled version, the M53/59 Praga, which were not effective at extremely close ranges. The Vz.53 was similar to the Soviet ZPU-4, but the Vz.53's lighter 12.7 mm cartridge had a lower effective range and did less damage than the Soviet 14.5 mm weapon.
One exception was the 1950s design US 203 mm (8 in) nuclear shell (M422) that had a triple-deck mechanical time base fuze. The time delay of a time fuze is usually calculated as part of the technical fire control calculations, and not done at the gun although armies have differed in their arrangements.
25-45 Sharps : Uses the standard military 5.56x45 case (also .223 cases), the neck is simply expanded to .257" 6.5mm Grendel : The Grendel uses the same head and rim from the .220 Russian and the 7.62x39 with a rim diameter of 0.441-0.449.
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