Nice build that was brought in on consignment. To replicate this would cost over $1,500! Lower - DPMS Upper - Aero Precision Front quad rail (model M4A1) - Daniel Defense Fore grip - Knights Armament Muzzle brake - Surefire Iron sights - Daniel Defense Pistol grip - Daniel Defense Buttstock - BCM Bolt carrier - Aero Precision Charging handle - Radian Raptor Ambi-safety - unknown