Luth-AR 9mm Carbine Buffer Assembly - Mil-Spec Black. 3 oz Specifications for Luth-AR 9mm Carbine Buffer Assembly - Mil-Spec: Manufacturer: Luth-AR Color: Black Finish: Hard-Coat Anodized Fabric/Material: 6061-T6 Aluminum Gun Make: AR Platform Weight: 5.45 oz Buffer Tube Size: Mil-Spec Caliber: 9mm Luger Features of Luth-AR 9mm Carbine Buffer Assembly - Mil-Spec 9mm Carbine Buffer Assembly with Mil-Spec Buffer Tube Package Contents: Luth-AR 9mm Carbine Buffer Assembly - Mil-Spec 9mm Buffer Mil-Spec Carbine Buffer Tube 6-Position Buffer Spring Castle Nut Latch Plate Luth-AR 9MM-M-BAP: 9mm Carbine Buffer Assembly - Mil-Spec Black