Great buffer system - KAK AR-15 Configurable Buffer Kit

If you want to dial in the correct buffer weight for your carbine this is a great system. The price is very reasonable considering it does not cost much more than a quality non configurable buffer. In addition, you can configure up to 9 different buffer weights rather than 5 with the standard carbine, H, H1, H2, H3 buffers. This really helped with my recent 7.62x39 AR pistol build. The system does not come with directions but it’s fairly self explanatory and you can also find the information on the KAK website. Spacer, weight, spacer, weight, spacer, weight, spacer, bumper, roll pin. Make sure you have a roll pin punch or similar.