Overhead view of 20MM armament

 

Barrels 20-65
Mounts 20-65
Projectile Weight 4.3 ounces
Muzzle Velocity 2,740 feet per second
Range Surface
Barrel Elevation = 35 deg.
4,800 yards (2.7 miles)
Anti Aircraft
Barrel Elevation = 90 deg.
10,000 yards (5.7 miles)
Firing Cycle 450 rounds per minute or 7.5 per second

 

20 MM Anti Aircraft Gun This is the 20mm single mount with the Splinter Shield removed. They were used as the last defense when a plane got in past the
5-inch and the 40mm guns.
Click on photo for full view
Here are the 20mm Guns with Splinter Shields in place. The sights on this photo was scratched out by Censors because they were top secret at that time Marines man 20 mm Anti Aricraft guns

 

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