I want to attach a folding spike bayonet to a preban Polytech AKS. I have the spike boyonet, but need the folding mechanism which attaches to the barrel, and front sight with the bayonet lug (Preban feature for spike when in extended mode). Polytech and Global Trades only offers the spike itself. If anyone has these parts or is aware of where I can purchase them I would be interested. Thank you.