The Kriss Vector Ambidextrous Folding Stock Adapter for GEN II 2017 is constructed of hard coat anodized aluminum and steel and allows for the attachment of AR-15 type buffer or pistol arm brace tubes. The adaptor can be configured to fold to either the left or right side with only a few tools in a matter of moments.NoteThis part is only compatible with the Gen 2-2017 Vector which does not have the original hinge mount. This part is incompatible with the Gen 1 and Gen 2 (hinged) Vector.