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M61A2 20-mm Cannon
The F-22's close-range weapon is the M61A2 20mm cannon and its associated components. The M61 is a proven gun, having been the U. S. military's close-in weapon of choice dating back to the 1950s. The F-104, F-105, later models of the F-106, F-111, F-4, B-58, all used the M61, as does the Air Force's current F-15 Eagle and F-16 Fighting Falcon, and the Navy's F-14 Tomcat and F/A-18 Hornet. The system is integrally mounted in the aircraft and located on the right side of the aircraft between the wing (top side) and fuselage. It is a fixed-forward firing mount. A gun door, located in the wing root area, is hydraulically controlled to open when firing the gun, which allows the rounds and blast pressure to clear the muzzle. A 480-round closed loop ammunition feed and storage subsystem is housed integrally under the right wing root/fuselage for easy ammo upload and download of empty casings. The gun system consists of the M61A2 gun, the Linear Linkless Ammunition Handling System (LLAHS), the hydraulic drive system, and the gun door/gun port and gas purge system.
Like the F-35B, it also will have a stealthy, missionized 25 mm belly gun. The combat radius on internal fuel will be greater than 700 NM- again, more than twice the range of the aircraft it is designed to replace."
"The F-35B will have a stealthy, belly-mounted 25 mm missionized gun pod and a combat radius of more than 450 NM- nearly two times that of legacy STOVL strike fighters."
"F-35A with an internal 25 mm gun mounted on the left intake shoulder and a combat radius of more than 600 nautical miles