Stern Defense 9mm Bolt Replacement Kit Black BOLTREPK. Using some of the most efficient materials out there these AR15 Lower Parts from the industry experts at Stern Defense will give you numerous years of the reliable and efficient service you've been trying to find. At OpticsPlanet it is our intention to make certain you've got adequate options to purchase the perfect AR15 Lower Parts for all of your expectations and the Stern Defense 9mm Bolt Replacement Kit for SD BU9 is one of the products that we're very happy to feature. Stern Defense has been dedicated to crafting top-quality AR15 Lower Parts for a remarkably prolonged time period and the Stern Defense 9mm Bolt Replacement Kit for SD BU9 is the final result of their continual endeavors and attentiveness to detail. For an extraordinary means to be sure you are shooting using one of the best lower receiver kits the field can give choose the Stern Defense 9mm Bolt Replacement Kit for SD BU9. Specifications for Stern Defense 9mm Bolt Replacement Kit for SD BU9: Manufacturer: Stern Defense Color: Black Gun Model: AR-15 Package Contents: Stern Defense 9mm Bolt Replacement Kit Included: Custom 4140 billet extractor providing superior ejection. Extractor pin. Extractor spring. Firing pin. Firing pin Spring. Firing pin retaining pin. Stern Defense BOLTREPK: 9mm Bolt Replacement Kit Black