USS Cassin Young DD-793 - 20mm Anti-Aircraft Guns
Range:
Surface(35°): 3mi / 4km
Altitude(90°): 6mi / 9km / 10,000 feet
Projectile Weight: 4.3 ounces
Rate of fire: 450 rds/min (7.5per/sec)
Muzzle Velocity: 2740ft/sec
WW2: 7 single barrel mounts
1952-1953: 20mm’s on fantail removed
1958: Remaining 20mm’s removed
1980: 20mm placed on fantail
