I bought this 4" diameter V2 rocket many years ago and I can't find information about it. I found one that looks just like the kit at www.scalerockets.com, but I know this isn't the place I bought it from. Theirs are made for H motors and this one is a 29mm.
Hint: there was something going on with the company: store closed but still selling on line? Or they just make the 4" diameter V2 now? If I saw their advertising I would easily recognize it.