Definitely scratch built.
I do plan on replacing both the cupseal and the chamber face seal. I'll certainly order the cupseal and face seal from PPS, but have other sources for o-rings and screws, as I'll need quite a few for rebuilding all my markers that need work.
I'd like to place only one order with all the o-rings and screws I'll need at the same time, but I'll need to work out the missing size info first.
What is the difference between the different color face seals from PPS? I don't remember there being a difference once upon a time.