Category:Mk 12 cannon
The Colt Mk 12 cannon was an advanced derivative of the wartime Hispano HS 404 that had been used on a variety of American and British fighter aircraft during World War II. It used a lighter projectile with a bigger charge for better muzzle velocity and higher rate of fire at the cost of hitting power. It entered U.S. Navy and U.S. Marine Corps service in the mid-1950s, replacing the Navy's earlier M3 cannon. In service, the Mk 12 proved less than satisfactory. Although its muzzle velocity and rate of fire were acceptable, it was inaccurate and frequently unreliable. Nevertheless, the Mk 12 was standard cannon armament on gun-armed Navy and Marine Corps fighters from the early 1950s to the early 1960s, including the F4D Skyray, F3H Demon, A-4 Skyhawk, F-8 Crusader and the A-7A/B Corsair II.