The nostagger.zip file you have requested: Mods / Mini Mods / Anti-Stagger Mod - 434kb is not available. Perhaps try browsing all files for the game Aliens vs. Predator 2 and upload any files you want to share or are missing. This is the only information we could locate:
This mod simply fixes two animation glitches that let you super rapid fire the pulse rifle and sniper rifle. This mod requires both the server and the client to have it.