I built this upper for a coworker and he backed out due to personal issues. All parts are top shelf and it was assembled with proper technique and tools. This is not a garage hack build. The 1/8 twist bull barrel is properly torqued to 40 ft./lbs on Mega arms hd billet upper. BCG is hp mpi melonited with proper gas key staking. Charge handle is WMD nickel boron coated. FDE 15" Keymod free float handguard is properly indexed and has spare rail sections that will be included. Headspace is proper and it has been test fired exactly 5 times to prove function (target shown).The recoil impulse is smooth and light due to rifle length gas system. Lower Receiver, scope, scope mount and bipod in pics are not included. Pin this upper on your lower and have a serious varmint rig or paper puncher. The Wylde chambering will handle both 223 rem and 5.56 NATO. $650 obo.