The VLTOR A5 Buffer and Spring Kit includes all essential components to enhance your rifle with VLTOR's innovative A5 Buffer System, designed specifically for compatibility with VLTOR A5 products. This kit includes the A5H2 buffer, a specially engineered A5 buffer spring, a VLTOR lock plate, and a VLTOR castle nut. It is important to note that this system requires a compatible A5 receiver extension tube to function properly, as the dimensions of A5 components differ from standard carbine or rifle buffers. Mixing components from different buffer systems is not only ineffective but could also lead to firearm damage or personal injury. Upgrade your rifle's performance with this reliable and efficient buffer kit.