877-323 Tools Parts Gasket Kit Bumper, Ribbon Spring, O-Ring Gasket pneumatic tools Air Nail Gun Parts. for Hitachi NR83 NR83A NR83A2 Air Nail Gun Parts. Package Includes: 877-323 Piston Driver 877-334 Aftermarket Gasket 877-325 Aftermarket Gasket 877-852 Aftermarket Gasket 877-854 Aftermarket Gasket 877-329 Aftermarket Gasket 878-421 Aftermarket Ribbon Spring Set 878-303 Piston Bumper. handy kit makes an overhaul repair of your NR83 framing nail gun fast & easy. These parts install quickly to make your nailer work like new again. A brand-new, unused, unopened, undamaged item in its original packaging.