Sons of Liberty Gun Works Broadsword-89 Upper Half 18in 6mm ARC Precision Barrel BS UPPER 16.75in M89 Rail Optional To AddMuzzle Device BCG or CH. With relief cuts on the face of the upper receiver the BROADSWORD-89 upper seamlessly integrates with our M89/L89 handguards. This enhanced lockup reduces fail flex even further so aggressive bipod and barricade loading will have the least impact on POI shift of any combination weve ever tested. Specifications for Sons of Liberty Gun Works Broadsword-89 6mm ARC Half Upper Receiver: Manufacturer: Sons of Liberty Gun Works Color: Black Caliber: 6mm ARC Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Barrel Length: 16.75 in Handguard Length: 16.75 in Magazine Included: No Overall Length: 18 in Package Contents: Sons of Liberty Gun Works Broadsword-89 6mm ARC Half Upper Receiver Sons of Liberty Gun Works BROADSWORDUPPER-89-18-6ARC: Broadsword-89 Upper Half 18in 6mm ARC Precision Barrel BS UPPER 16.75in M89 Rail Optional To AddMuzzle Device BCG or CH Black