Luth-AR Vintage Style AR15 Firing Pin Retainer Chrome Plated Steel Silver. The firing pin retainer secures the firing pin into place and will work with standard AR-15 bolt-carriers. Specifications for Luth-AR Vintage Style AR15 Firing Pin Retainer: Manufacturer: Luth-AR Color: Silver Fabric/Material: 1045 Steel Gun Model: AR-15 Features of Luth-AR Vintage Style AR15 Firing Pin Retainer Vintage style original retaining pin Replaces the existing firing pin cotter pin Easy to replace remove and install Snug fit Open slot to achieve desired tension 1045 Carbon Steel Heat Treat HRC 45-50 Package Contents: Luth-AR Vintage Style AR15 Firing Pin Retainer What firearm models does the manufacturer say Luth-AR Vintage Style AR15 Firing Pin Retainer is compatible with? The manufacturer says that Luth-AR Vintage Style AR15 Firing Pin Retainer is compatible with AR-15Luth-AR BT-16S: Vintage Style AR15 Firing Pin Retainer Chrome Plated Steel Silver