Aero Precision X15 complete upper 20" Quad rail

This is a new custom 5.56 NATO caliber (Also shoots .223 Remington) upper assembled using a forged aluminum mil-spec Aero Precision X-15 upper receiver in black annodiz finish.  It has a 20" 1:7 twist, rifle length gas system, Modern Series  American made Nitride barrel from Ballistic Advantage.  It is threaded 1/2-28, and has a nice QUAD rail from NCStar and it's topped with a mil-spec flash suppressor.  This upper receiver includea a nitride  Aero Precision bolt carrier group and a mil-spec charging handle.   All parts are new.