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The Mark 38 25 mm MGS provides ships with short-range capability against high-speed maneuvering surface targets (HSMSTs), [5] floating mines, and enemy swimmers. Ships close to land can use the system against enemy personnel and lightly armored vehicles. [2] It is a low-cost weapon that can operate in any weather condition, day or night.
In the anti-materiel role, a 25 mm weapon armed with armor-piercing rounds can disable many types of aircraft and ground vehicles, including some main battle tanks. The US military uses 25 mm weapons in their AV-8B Harrier, AC-130 gunship, M2 Bradley, LAV-25, F-35 Lightning II and as a standard ship-based munition in the Mk 38 autocannon.
The M1 ammo crate held a total of 1,000 belted or linked rounds packed in 4 M1 ammo boxes and the later M1A1 ammo crate held a total of 1,000 belted or 1,100 linked rounds packed in M1A1 ammo boxes. There were two .50 M2 ammo boxes to a crate (for a total of 220 belted or 210 linked rounds) with a volume of 0.93 cubic feet.
The Mark 12 5"/38-caliber gun was a United States dual-purpose naval gun, but also installed in single-purpose mounts on a handful of ships. The 38- caliber barrel was a mid-length compromise between the previous United States standard 5"/51 low-angle gun and 5"/25 anti-aircraft gun .
The M811 is an automatic, externally powered, single- or dual-fed autocannon firing NATO standard 25mm ammunition, designed by Nexter Systems (previously GIAT Industries). [ 1 ] History
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.
The XM25 has an effective range for point targets of 600 m (660 yd), and a maximum range for area targets of 700 m (770 yd). Studies indicate that the XM25 with air burst rounds is 300 percent more effective at engaging the enemy than other squad-level grenade launchers.
The Mark 17 gun in the Mark 40 submarine gun mount may have used semi-fixed ammunition (case and projectile handled separately), but existing WW II photographs, drawings of ammunition storage, and museum ships all show fixed ammunition (one piece service round). It had a range of 14,500 yards (13,300 m) at the maximum elevation of 40 degrees. [5]