The mp5viperslot1.zip file you have requested: Shadow of Chernobyl / Mods / Weapons / Viper to Pistol Slot Mod - 129.86kb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R. Shadow of Chernobyl and upload any files you want to share or are missing. This is the only information we could locate:
This mods makes the Viper fit in the pistol slot so you can switch to a larger weapon without removing the viper.