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 SpringA slight increase in spring power makes this spring suited for rack grade weaponry with normal operation parameters. 16a ^2 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 TubeAmerican 7075-T6 AluminumHeld to mil-spec or better tolerances6 Adjustment PositionsH2 Heavy Buffer1 Steel Weight and 2 Tungsten Weights (4.7oz)Hardened Castle Nut w/ Staking CutsMil-Spec End Plate