The Vulcan could react quickly enough to the fleeting targets .
Vulcan 's 20 mm gun had an effective range of only about 1,200 meters , far shorter than the 3,000 to 5,000 meters range of the 9K114 .
The Vulcan could react quickly enough to the fleeting targets , but its 20 mm gun had an effective range of only about 1,200 meters , far shorter than the 3,000 to 5,000 meters range of the 9K114 .