I think the guide from a Safari/Olympic Enforcer can be adapted. It uses the same mounting, riding on the slide stop pin instead of the frame. The guide/plug/spring is sold as a unit, for about $100. I had Cylinder & Slide build a custom guide rod/plug set-up for my Combat Master, but it didn't work out; you might call them and see if they'll help you. I think the total cost was about $75.