The Armaspec SRS Buffer Kit AR9 Gen 4 provides a complete buffer tube assembly solution featuring the enhanced SRS GEN3 multi-stage recoil buffer system and mil-spec 7075-T6 6 position buffer tube.Armaspec SRS Buffer Kit AR9 Gen 4SRS-BB Buffer weighs 5.7oz for optimal performanceMil-spec 7075-T6 aluminum 6 position buffer tubeSteel castle nut and end plate includedComplete kit with all necessary mounting componentsFits AR-15 pattern firearmsThis complete buffer tube kit contains everything needed to mount a stock assembly on your lower receiver delivering enhanced recoil management and reliable operation for AR-15 platform builds.