In vanilla S.T.A.L.K.E.R.: Call of Pripyat the guns have changed names. This addon changes them to the real ones.
===Installation===
Put the 'gamedata' folder into your game folder and restart the game.
Compatible with 'CoP Iron Sights Height Fix (16x9)'.
Just accept all changes.
I already made a mod like this about two years ago which has support for non-English languages and also covers other text referencing the weapon names, such as dialogue in Zaton.
Moddb.com