I have a new in box Knight Disc Extreme Conversion Kit, Knight Part #900607 for sale. Kit converts original .50 cal. disc rifle which usesorange plasticdiscs to use the red full plastic jackets found on thedisc extremerifle. Kit includes replacement bolt, bolt retention screw, breech plug, and 20 full plastic jackets. Will sell for $50 plus $5 shipping to lower 48 states. E-mail me if interested.