Actually I think they are conventional guns...IIRC there was an episode where a bunch of cylon assault robots (the shiny metal ones not the human looking ones) managed to get onboard the ship. I haven't seen the episode in quite a while but IIRC the bullets pretty much bounced off them and also Apollo mentioned being out of AP rounds.

But in battlestar Galactica ,still had many bugs.
In superluminal era, The human still used the "ammunition" weapons? It's unimaginable, right?
Even civilian spacecraft are able to achieve "light" jump!
But in such advanced warships had a "traditional ammunition" weapons,
Those poor people living in simple tent.
I really do not know, is a time-wrong, or is a mistake of director ?
Human weapons, equipment tactical of Earth's 20th century era, coordinate "superluminal" transportation equipment 30-century Earth, What is wrong?