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Expert Answer
The number of positions are determined by the buffer tube, not the stock. 4-position buffer tube? you have a 4-position stock. 6-position buffer tube? 6-position stock.
A movable cylinder or large pin in the stock drops into the matching receptacle in the buffer tube.
Of grater concern is whether your stock is mil-spec, or commercial. A commercial diameter stock is not compatible with this mil-spec buffer tube.
Mark H.