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Buffer tube, castle nut & end plate for indexing the tube. Then a stock itself. That should be all. An AR stock tool or a punch & hammer will be needed to tighten the tube.
For the SAN rifles, the upper is the firearm. The lower is an unregulated part. Swapping the lower to the NEA manufactured one does not change the gun's classification, so the black special and classic green remain non-restricted.
Buffer tube, castle nut & end plate for indexing the tube. Then a stock itself. That should be all. An AR stock tool or a punch & hammer will be needed to tighten the tube.