I don't play CSS much, except when I want to drool over high-quality costum weapon models that I wish were converted and imported into Raven Shield.
That, and it's hilarious when you have the radio voicing replaced with a danish mid-jutland farmer accent and all the guns sound like a bunch of kids shouting "bang" and "kaboom".
Seriously, I have about 7 good friends all laying voice to my weapon collection. The AK-47 COUGHS fer pete's sake. :
The M4 says Bang, the Deagle Boom, the Glock Glock's (not kidding) and the P90 Pew's. And getting headshotted often rewards you with a high-pitched "Ha Ha" and/or a "DOH!"