AR 15 disassembly

[siguser]

First off, I hope this is in the right folder (this is my first post) if not any help is appreciated.
So anyway, I want to remove the buffer tube on my Olympic Arms AR15. It looks like it's threaded on but I can't seem to remove it and the manual doesn't say anything about it. I'd like to put a collapsible stock on it so that's why I'm doing this. Any tips on how to remove it w/o breaking it?

 

[dfariswheel]

Here's a complete set og GI manuals that show full disassembly:

http://www.biggerhammer.net/manuals/

http://www.stevespages.com/page7b.htm

 

[45shooter]

Take a look here about half way down.

http://www.rbprecision.com/rb_precision_ar15_performance_tips_.htm

 

[siguser]

Thanks dfariswheel and 45shooter for the links. Much appreciated