Luth-AR Vintage Style A-R10 .308 Firing Pin Retaine Silver/Chrome. The firing pin retainer secures the firing pin into place and will work with standard AR-10 bolt-carriers. Specifications for Luth-AR Vintage Style A-R10 .308 Firing Pin Retaine: Manufacturer: Luth-AR Color: Silver/Chrome Finish: Matte Fabric/Material: Carbon Steel Caliber: .308 Winchester Gun Make: AR Platform Gun Model: AR-10 Gun Type: Rifle Features of Luth-AR Vintage Style A-R10 .308 Firing Pin Retaine Vintage style original retaining pin but for the .308 Replaces the existing 308 firing pin cotter pin Easy to replace remove and install Snug fit Open slot to achieve desired tension Package Contents: Luth-AR Vintage Style A-R10 .308 Firing Pin Retaine Luth-AR 308-FPR-C: Vintage Style A-R10 .308 Firing Pin Retaine Silver/Chrome