The ARMASPEC SRS BUFFER KIT BB GEN 4 is designed for optimal performance and reliability, providing everything needed to effectively mount a stock assembly on your lower receiver. This comprehensive buffer tube kit features a durable mil-spec 7075-T6 buffer tube, coupled with a robust steel castle nut and end plate, ensuring exceptional stability and function. The unique SRS GEN3 multi-stage recoil buffer system enhances shooting comfort. SRS-BB Buffer, 5.7oz Includes SRS Buffer, 6 Position Buffer Tube, Endplate and Castle Nut Fits AR-15 Pattern Firearms Elevate your shooting experience with the ARMASPEC SRS BUFFER KIT BB GEN 4.