The basixaddonmp52psbrv.zip file you have requested: Clear Sky / Mods / Singleplayer / Basix Add-on: MP5-2-PS-BRV - 3.83mb 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 puts a custom MP5 in the pistol slot. Adds also a brand new skin to differentiate it from other MP5s in the game. Custom installations for Basix CS series, CS Redux, and "Vanilla".