this neat little trick that not many people know about. will help you learn the spray /recoil patterns of the guns /weapons in counter strike source.
make your own server then type these console commands into console
now when you shoot something in counter strike a red square will appear for 5 or 6 seconds showing you where you hit
this is great for practicing how to control your spray from the ak 47
or m4 a1 i use it allot for practice to see where i am hitting on the other side of doors and walls note: this is only for practice in your own server as it will not work in public servers where sv_cheats is not enabled but none the less it is a great way to learn spray patterns