The design of any of our 'Universal' adapters, is specifically intended to work with our Spartan 300 bipods.
The bipod has a small fin or key on its outer surface that is intended to lock into the small notch located on the front or rear face of the adapter socket.
For users who have no intention of using a 300 bipod then the notch is of no importance.
The notch area of the 'Universal' adapter is lined with a small polymer insert, that designed to reduce the wear between the metal parts of the Spartan 300 bipod and the adapter itself.
These small polymer inserts are intended to be a wear item, that can be replaced if worn or damaged, without the need to replace the adapter its self.
The insert can be prised out of the notch using a small screwdriver, and the replacement simply pressed back into the socket.
We would recommend a tiny spot of adhesive be applied to the socket prior to refitting to ensure that the adapter stays aligned.
Please contact us if you require replacement inserts.