This AR-15 build is outstanding for the price, it's a Palmetto state upper and BCG, with an Aero Precision lower and standard GI trigger group. It has and FN cold hammer forged 20" barrel w/ a 1:7 twist. It also has a Knights Armament quad rail with rail covers, a tango down vertical grip with inbedded surefire switch for the surefire WTS weapon light. And last but not least a Trijicon 5.5x50 ACOG (not standard to the M16a4) that works excellent with the long barrel.