Angstadt Arms AA40BUFKIT Buffer Kit with Black Finish weighs 10 oz for 9mm Luger 40 SW 45 ACP AR15 Includes Carbine Buffer Spring

Complete 10oz ar-15 extra heavy buffer kit gives you everything you need to get your 9mm, 40 s&w or 45 acp ar-15 running smoothly.Compatible with both glock and colt style magazines.