That sound is much closer to how a colt truly sounds. I believe if you play vietnam black ops you'd see.
Also, no, I am not a wall hacker. On maps such as dust, when playing any team there is the bridge part. People tend to duck there and fire, finding themselves behind the safety of the balcony wall. Unless you have a colt or ak or similar, you wont hit them.
*edit*
Also, even though it is left handed, it looks sooo much better than those toy guns that CS provides you with.
I also have an AK-47 model that places the AK almost directly in the center of view, which is more realistic. Unfortunately, the crossair doesnt look properly aligned with it.