i just found a way of changing your aug/sig sprites without downloading new sprites.
all you have to do is go in to the /cs/sprites file.
find the weapon_aug.txt or weapon_sg552.txt
put these two lines of text in
zoom 640 ch_sniper 0 0 256 256
zoom_autoaim 640 ch_sniper 0 0 256 256
and replace the 10 in the top left with 12
and it works
the webby i found it on is here
http://www.bullseyecrosshairs.com/hlsites4.shtm (http://www.bullseyecrosshairs.com/hlsites4.shtm)
much easier to see, havnt used em yet only quickly went on 2 server to see the aug one.