Thanks for the replies chaps. On the Chambers schematic it shows different trigger struts on the lightening and Superstar, TR034 (Superstar) v the TR032 on the lightening. This could just be the difference between pseudo two stage v single stage though. Apart from the blade this is the main difference I can see. If I can make the lightening Tac trigger as good as I had the one on my Superstar I'll be a happy bunny ☺️