TacFire Official six-position adapter tube is lightweight, crafted of high quality grade glass filled nylon polymer for superior durability non-compromising design and material to enhance tactical performance. This adapter tube is used specifically for a stamped receiver compatible with AK47 7.62x39 Romanian. This will replace the standard fixed butt stock allowing it to fit a 6-position commercial grade collapsible stock.  Simply remove the factory fixed stock & slide the adapter tube in place the tube will then be secured with the original stock screws.