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					Originally Posted by Roverron  There's about any option, caliber, length, etcetcetc.   BARREL has to be 16.1" min or you get to apply for stamp.  Here's a link: http://www.ar15.com/forums/f_3/4_Build_It_Yourself.html 
You will probably have to sign up for membership but there's also most of the mfgr's on this site too.
 
Goo luck, uppers are only a little more diff to build than a lower.  Probably takes longer to figure out/find what you want | 
	
 
Ron, you can have a 14.5 inch barrel as long as the flash hider/comp is pinned to the barrel. That is what I have on mine.