I have an AR15 A2 upper custom built by Gene Clark. For those of you who don't know, Gene is the head armorer for the Army Marksmanship Unit. The upper features a Krieger 1-7.7" twist 20" post-ban barrel, 1/4 x 1/4 pinned custom rear sight, and a specially designed custom chamber. This upper is brand new and has only been test fired by Mr. Clark himself.
Price for the upper receiver by itself is $1,250 shipped.