Projectile

Canon AA
The Canon is an AA gun design simple mode of operation makes it an ancient defense facility cheap but very effective. While this technology is obsolete but still enough against waves of fighters. It is a defense facility widespread among small empires on the newly colonized planets.

Gatling
Because of its rate of fire doubled the speed of supersonic bullets, the improved structure and an optimized configuration of its shields, the Gatling gun is a much higher efficiency than the Canon AA. Unfortunately, because of all these improvements, the Gatling gun is two times more expensive than its predecessor, the AA gun. She is also part of one of the weakest defenses.