I've been getting a bug lately where the mounted machine guns sound like they are shooting in slow motion. First I though I'd found some uber gun. Doesn't really bother me, It's actually kind of cool. Just seeing if anyone had the same bug.

It isn't a bug. Theres 3 types of mounted guns.

Standard machine gun (like the SAW)
the .50 cal I belive. (This fires slowly, and is the one you're talking about)
And the grenade launcher.

oh