

Plus, in most scenarios where you are firing your weapons at the Alien, you are not likely going to be alive long enough to see it die from its wounds.You likely kill several Aliens during the game, they just survive long enough to escape and die out of sight and get replaced by another one without your knowledge. The Alien isn't immune to your weapons, your guns just aren't of sufficient quality to kill it instantly (compare with the weapons used in the sequel which were top of the line military grade weaponry.). The answer to this is actually fairly clever.This would actually explain why getting shot by the paranoiacs will injure, but not initially kill, you they're the equivalent of BB rounds.So it makes sense that they can't penetrate the alien's thick armor. Most of the weapons are undoubtedly used by the security on board the station and most likely use a special type of ammunition designed prevent hull breaches.That, and it's hard for Ripley to get a clean shot since she's not an experienced marksman and the Alien moves very fast. Though an In-Universe explanation might be that the revolvers are very weak and weren't really meant to shoot anything that was built to last. There's only one Alien in the game Most of it, anyway, and if you could only take it out with just a few bullets, then the game wouldn't really have much else to go on. Plot Armor, combined with Conservation of Ninjutsu.Why is the Alien Immune to Bullets? Wasn't a harpoon gun able to tear clean through its torso in the first movie?.

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