Here is a quick look at our new AR15 Complete Stock Kits. The kits come with some great high end parts. Other companies sell kits, but the parts included are usually middle of the road. Ours come with the castle nut, end plate, Vltor Buffer Tube, Magpul MOE Stock and a buffer/spring combo. For the buffer/spring combo, you can choose between the JP Silent Captured Spring or the KynShot Hydraulic Buffer with a JP Spring.