Changing a fixed stock to an adjustable stock

You cannot re-use the existing buffer tube, buffer, buffer spring, or really anything.

You will need a new receiver extension for a CAR stock. Milspec or commercial diameter - you pick. You will also need the buttstock itself. Then you will need a CAR buffer and CAR spring. Finally you will need a receiver end plate and a castle nut to affix the whole affair.
 
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