Installation info is in the readme.txt that is contained int the download.
Latest beta, new version should be out very soon however :)
Description: The goal of this mod was originally to make the weapons behave more realistically. Since then, I have added other features that make the combat more realistic in general, including changes to the AI, mutants, and getting shot effects. I later decided to replace all of Nimbles's guns with guns that are "Artifact Mods" instead; not because they are realistic (well, not anymore than an artifact itself anyway) but because they are a ton of fun.
NOTE: THIS MOD IS INTENDED FOR MASTER DIFFICULTY. On lower difficulties it will be less realistic due to the player being able to take more damage from just about everything. Shooting in the open will get you killed fast.
INSTALLATION: Copy the the folders "gamedata" and "bin" into your Stalker directory. I suggest backing up your xr_Game.dll in the bin directory of your Stalker directory, because that it the one thing this mod overwrites. This mod can be used with other mods that don't contain any files that this overwrites other than the xr_Game.dll, which gets overwritten even on the vanilla version.