Vintage Air Gen-IV Magnum in a dart

Ya, took a me a while to get my head around ISIS, but i understand it now.
We have 1 dealer here in the springs for Vintage Air, I called them up and asked if they had a mock up for the gen IV magnum, they said no then threw some attitude when i asked who else I can go to for it.
Got an email out to vintage air right now for the mockup.