TacFire .308 Winchester 18 inch Rifle Kit w/ LPK No Forward Assist Black Large. 308 Winchester 18 inch Rifle Kit: Manufacturer: TacFire Color: Black Finish: Black Nitride Caliber: .308 Winchester Package Contents: TacFire .308 Winchester 18 inch Rifle Kit The TacFire RK308LPK18BN AR10 308 Winchester Build Kit With 18" Black Nitride Barre is a quality addition to the TacFire lineup. For more great deals on AR15 Upper Parts by TacFire please browse our Tacfire Gun Parts page. TacFire RK308NFA-18: .308 Winchester 18 inch Rifle Kit w/ LPK No Forward Assist Black Large