Need to convert your Kriss Vector V2 to Metal Threaded Buffer Tube, and open up your buttstock options?
Then this Solid Metal Threaded convertor / Adaptor is what you will need.

Please Note: These will thread to gen8 buffer tubes. For AEG type buffer tube you will need to use a nut and washer for tightening.

Please note: Opening up of the blaster and minor adjustment is required to fit this part.