The ammunition and shells fired by these weapons are usually fitted with different types of fuses (barometric, time-delay, or proximity) to explode close to the airborne target, releasing a shower of fast metal fragments. For shorter-range work, a lighter weapon with a higher rate of fire is required, to increase a hit probability on a fast airborne target. Weapons between 20 mm and 40 mm caliber have been widely used in this role. Smaller weapons, typically .50 caliber or even 8 mm rifle caliber guns have been used in the smallest mounts. COUNT 4
QSN1 What are two types of fuses used for shells? ANS1 barometric, time-delay, or proximity QSN2 At shorter ranges a light weapon with what is used on fast targets? ANS2 a higher rate of fire QSN3 What size of weapon calibers are better hitting at short range fast targets? ANS3 between 20 mm and 40 mm caliber QSN4 Smaller .50 caliber and 8 millimeter guns have been used in what? ANS4 smallest mounts