I've been using this crosshair for years now, it's far more accurate then the default TS crosshairs, and now you can own them too.
Download link:
http://www.filefront.com/17226438/Berkelys_accurate_crosshair.rarHow to install sprites.
1. Make back-ups of the originals (Optional but recommended)
2. Drag the 'sprites' folder to this directory:
C:\Program Files\Steam\steamapps\YOUR ACCOUNT NAME\half-life\ts\sprites
Windows will ask you if you would like to replace, just click 'Yes to all' and it will replace your current cross hairs with the one's I use.
3. Launch TS and test.
Have fun!
*Software you might need; WINRAR:
http://rarlabs.com/download.php