I originally made this to be implemented into the ZRP mod but the devs never decided to include it. I've completely revised the weapon hud placement for all of the vanilla guns as well as the placement of iron sights, shell ejections, and fire points. In the vanilla game, much of the positioning of these factors were off.
Unzip gamedata into your stalker directory.
If you have not used mods before, you will need to open your fsgame.ltx file found in the "C:\Program Files (x86)\THQ\S.T.A.L.K.E.R. - Shadow of Chernobyl" directory.
Open this file with a text editor and find the following line:
$game_data$ = false| true| $fs_root$| gamedata
Change the false to true, i.e.:
$game_data$ = true| true| $fs_root$| gamedata