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The threading is on the buffer tube which is included "It comes with everything you need to make it work. New Gen Model 15 Standard A2 Butt Stock Assembly • Stock Molded from Impact Resistant Advanced Polymer • Complete with A2 Extension Tube, Recoil Spring, Buffer Assembly, Stock Spacer and Screw • Storage Pocket for Cleaning Kit, Small Parts, and Other Accessories" So you thread the buffer tube on at the castle nut on the rear of the receiver and this slides over the the buffer tube Video of installation here https://youtu.be/BxzL_xfCM5w

Oops that other video was the unboxing video Video of installation here https://youtu.be/JSkC0BxonRw ---------