Turrets (video)

Trivia

 * Though Cave Johnson's statement regarding how they "fire the whole bullet" may seem nonsensical, the video demonstrates that they do indeed fire the entire bullet: instead of striking the primer on the back of the bullet to ignite the propellent inside and unleash the bullet like all other guns do, the turrets fire bullets via a pair of spring-loaded hammers that carry the entire cartridge out of the barrel. This also explains why the turrets don't eject any spend cartridges when firing.