Rock river arms 10.5 inch mountain pistol upper.  5.56/ 223 has only had 60 rds fired to function check.  Has all the extra rail pieces that have not attached.  Includes Vortex triumph red dot sight that is like new.  Call or text 5zero2five9two6nine1five.  No trades will not ship, would like to keep red dot and upper together.  $350.