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This is the top portion of the Upgraded Recoil Pad that completes the rear of the bolt assembly of the GHK PDW. It offers all the benefits of the full metal One Piece Recoil Pad without the enormous cost. This top portion is recommended to be printed in Stainles Steel or Aluminum in order ensure high strength. If you wish to have a full metal recoil pad, I have that model available as well, though it is a bit more pricey.
When ordering, make sure you also order the bottom part as well. The full assembly is designed to be glued together with a high strength super glue or epoxy. A low viscocity glue is recommended in order to get a good bond.