Dirty Bird AR-15 Optimized Carbine Receiver Extension / Buffer Kit

If you are trying to find the right buffer spring/buffer weight combo for your next SBR or a midlength gas system rifle, the Dirty Bird Optimized Buffer Kit is the way to go. Utilizing a Sprinco Blue Enhanced Power Spring and a H2 buffer, we have found the perfect combo to reduce the cyclical rate, reduce recoil, and insure proper ejection to keep your rifle running smooth as butter.Includes:Blue Sprinco Medium "Enhanced" Power Spring A slight increase in spring power makes this spring suited for rack grade weaponry with normal operation parameters. 16 rifles with midlength gas systems, short barreled rifles with carbine length gas systems, etc.Dirty Bird 7075-T6 True Mil-Spec Carbine Receiver Extension / Buffer Tube American 7075-T6 Aluminum Held to mil-spec or better tolerances 6 Adjustment PositionsH2 Heavy Buffer 1 Steel Weight and 2 Tungsten Weights (4.7oz)Hardened Castle Nut w/ Staking CutsMil-Spec End PlateMade in the USABacked by the Dirty Bird Industries Lifetime Warranty