This AR pistol upper was built to be an ultralight PDW or "bag gun", in 5.56mm. It features an Aero Precision upper receiver with no forward assist, a Faxon Duty Series 10.5" 4150 QPQ Nitride pencil barrel, a matching headspaced Faxon M16 BCG, a carbine-length gas system with a VLTOR ultralight gas block, a Noveske "Flaming Pig" linear compensator, a BCM asymmetric charging handle, and a Midwest Industries 10" ultralight M-Lok handguard. I have <250 rds through this upper. Reason for sale is a recent upgrade to a new upper.