The weapons.zip file you have requested: Clear Sky / Mods / Singleplayer / More realistic weapons - 193.36kb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R.: Clear Sky and upload any files you want to share or are missing. This is the only information we could locate:
This mod changes many aspects of the weapons in the game to give them realistic weight, bullet speed, range and other factors to make them handle more like their real world counterparts.