Product DescriptionThe KNS Precision AR-15 Perma Pin Firing Pin Retaining Pin is a durable upgrade that replaces the standard cotter pin in an AR-15 bolt carrier to securely retain the firing pin. Designed to work with standard AR-15 bolt-carrier groups, this retainer is made from heat-treated steel for strength and flexibility. It is intended for AR-15 carriers only and is not compatible with .308 bolt-carrier groups.Product HighlightsReplaces the standard AR-15 bolt carrier cotter pin to retain the firing pinFits standard AR-15 carriers and AR-15 bolt-carrier groupsHeat-treated steel construction for strength and long-term durabilityPerma-pin style retainer helps keep the firing pin secured during operationNot compatible with .308 bolt-carrier groupsSpecsProduct Type: Firing pin retaining pin / firing pin retainerCompatibility: AR-15 carrier / standard AR-15 bolt-carrier groupNot Compatible With: .308 bolt-carrier groupsMaterial: Heat-treated steelColor/Finish: BlackManufacturer Part Number: PERMAUPC: 851876003011Brand: KNS Precision, Inc.Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.