You were wanting a decent model of a xenomorph. There is a alien drone and alien queen. The models are to high poly for fpsc so you will need to make them low poly or use them as a reference and make your own. You will also need to make textures and animate them. There is only two aliens for fpsc one from cp's scifi pack 3 made by jewish dude, and the other is from an older pack from cp that you will need to email him for. The one from jewish dude is better than the older one based on speed, if you based it on textures they are equal. There is a quake model on filefront that is decent as well, but you would still have to rig it for fpsc.
My point is if you want a copyrighted entity you will need to make it yourself or provide an email for which someone will make you one of the forum. I have six versions of the xenomorph for my game three were not made by me and the other three were. I don't plan on giving those away just yet.
Now, you have the best link for the best alien xenomorph that I have found in my previous post and just to be nice I will give you the cp's pack and filefront quake model.
Cosmic's Sci Fi pack 3
[href]http://www.mediafire.com/download.php?1kvdfznduf1
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Quake model
[href]http://www.filefront.com/Alien/;6825;/fileinfo.html
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You can also go to fps-files and get cp's pack if you have a problem with mediafire. Also you have not said whether or not you have attempted to make this model on your own. There are free modeling programs out there that you can use. Fragmotion and milkshape have thirty days to make any model you want. I hope this helps you.
[EDIT]:I do want to know are you the one been emailing me about the alien in my game?