Rather than actually firing anything, a video game gun is coded such that it instantly registers hits on whatever it's pointed at when the trigger is pulled.
- Fun fact: Your mouse clicks are hitscan. Test it by going to the unabridged version HERE.
http://tvtropes.org/pmwiki/pmwiki.php/Laconic/HitScan
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Rather than actually firing anything, a video game gun is coded such that it instantly registers hits on whatever it's pointed at when the trigger is pulled.