New front rail to adapt this GL to the KWA Kriss Vector: https://cults3d.com/en/3d-model/tool/grenade-launcher-kit-for-kriss-vector-fits-any-gun-with-a-picatinny-rail

Can be oriented either way to best suite the spacing you need as the picatinny slots have different spacing relative to the mounting pin holes. Print vertical for max strength.