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It is a positively locked breech, gas and recoil operated cannon with a rotating bolt head and a dual-belt selective feed system taking a 25mm NATO cartridge. The rate of fire in burst mode is up to 600 rounds per minute but it can be adjusted electronically and reduced to single shot or a selectable range from 100 up to 175 rounds per minute. [1]
The test cartridge must be inserted into the chamber in such a way that the hole in the test cartridge case lines up with a gas port hole that channels the gas pressure from the cartridge case to the face of the sensor. The measurement accuracy of the pressure measurements with 21st century high-pressure sensors is expected to be ≤ 2%. [7]
The GAU-22/A's major difference is the use of four barrels, rather than the GAU-12/U's five barrels. The GAU-22/A is lighter and has a reduced rate of fire of 3,300 rounds per minute, but maintains the same, high accuracy of 5 milliradians, 80% circle [2] of the GAU-12 [3] and A-10's GAU-8. [4]
Overall, it was more comparable to the 20 mm Oerlikon, though vastly inferior to the 40mm Bofors weapons used by the US and allies in every respect except rate of fire (and only barely in that respect: the Bofors could put out a sustained 120 rounds per minute because of its constant-fire top-fed ammo clip design, whereas the 25mm's frequent ...
An additional feature of the XM307 is that it can be converted into the XM312, a 12.7 mm (.50)-caliber version for infantry and light anti-armor support in under two minutes (1 minute, 42 seconds). 25mm Training Practice projectile.
The M242 Bushmaster chain gun is a 25 mm (25×137mm) single-barrel chain-driven autocannon.It is used extensively by the U.S. military, such as in the Bradley fighting vehicle, as well as by other NATO members and some other nations in ground combat vehicles and various watercraft.
This test is performed under normal conditions at 21 °C (70 °F), but also by simulating cold polar −54 °C (−65 °F) or hot desert 52 °C (126 °F) conditions using special cooling equipment and ovens to cool or heat the ammunition under test to the appropriate levels of humidity and temperatures required.
The XM25 CDTE fires 25 mm grenades that are set to explode in mid-air at or near the target. A laser rangefinder in the weapon is used to determine the distance to the target. The user can manually adjust the detonating distance by up to 10 feet (3.0 m) shorter or longer; the XM25 automatically transmits the detonating distance to the grenade ...