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This is an Upgraded Recoil Pad that completes the rear of the bolt assembly of the GHK PDW. It upgrades the stock part that is somewhat brittle and seems to be prone to breaking under normal use. The part is designed to be printed in Stainless Steel or Aluminum.
If you'd like a cheaper option to get your PDW going again, check out the Hybrid Version that has all the benefits of the metal, and much cheaper than this full metal verision. You can find the Top Piece HERE, and the Bottom Piece HERE.