The shotgun_mod.zip file you have requested: Clear Sky / Mods / Weapons / Shotgun Mod - 2.94mb 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 makes many changes to the shotguns in the game. Pricing, power, range, everything gets redone and improved. See the readme for full details.