Help you remember the mod (S.T.A.L.K.E.R.: Shadow of Chernobyl)

The platform on which mod I can't remember. I remember very well that in this fashion was very a lot of locations. And swamps (those that were in clear sky), in the North of the railway, it was possible to find under the train carbine Simonov, it still seems to be a quest some were in search of ancient weapons. Still, like in this fashion, the beginning of the game takes place on a peace corps in a little shack, but it's not exactly something can confuse.
Still seems to be in this fashion was cars, but it is also not accurate. The only clue is a carbine Simonov, then I'm 100% sure.
Very long played this mod and I would like to play again. The mod's name seems to have been delineate. Don't remember more. Already messing with the axle in the head with these mods. Help to remember please.