[url]www.olyarms.com[/url] and Rocky Mountain Arms both made pre-ban AR pistols.

[img]albums.photopoint.com/j/View?u=1130110&a=10062068&p=33629384[/img]
Rocky Mountain Arms "Patriot Pistol"

Olympic also makes a post-ban pistol (the swiss-cheese OA-98), a fixed-mag pistol, and an AOW.  Professional Ordnance makes Carbon-15 pistols, which aren't truely AR15-based, but use AR mags and some parts.

Due to the 50 oz. weight restriction on post-ban pistols, it's impossible to make a legal AR pistol from standard AR15 components.  All of the post-ban solutions use custom components to make weight.

-Troy