Ever wonder how much buggier Stalker was before it was released? Ever wonder about features and areas dropped from the final release? Wonder no more: the devs have released a 2004 build of Stalker for you to run around in. I haven't tried it, but maybe it's bug free with realistic weapons:
http://gsc-game.com/index.php?t=com...xr&thm_page=1&thm_id=17037&sec_id=16&offset=0
http://gsc-game.com/index.php?t=com...xr&thm_page=1&thm_id=17037&sec_id=16&offset=0