Luth-AR LR .308 Bolt Carrier - Complete Black. 308 Bolt Carrier Assembly/Extractor Assembly for AR. Specifications for Luth-AR LR .308 Bolt Carrier - Complete: Manufacturer: Luth-AR Color: Black Carrier Material: 8620 Steel Bolt Material: Steel Gun Make: AR Platform Gun Model: AR-10 Hand: Right Included Accessories: Firing Pin Retaining Pin Carrier Key Cam Pin Firing Pin Features of Luth-AR LR .308 Bolt Carrier - Complete Bolt Carrier .308 Bolt w/extractor installed Package Contents: Luth-AR LR .308 Bolt Carrier - Complete Bolt Carrier .308 Bolt w/extractor installed Carrier Key Firing Pin Cam Pin Firing Pin Retaining Pin Bolt carrier key screws (2) What firearm models does the manufacturer say Luth-AR LR .308 Bolt Carrier - Complete is compatible with? The manufacturer says that Luth-AR LR .308 Bolt Carrier - Complete is compatible with AR-10Luth-AR 308-BCA: LR .308 Bolt Carrier - Complete Black