I think I recall Jim telling me it is, that he ended up with the rights to produce it after Massey quit making bows.
I've heard three versions now of the origin of the Massey Longhorn design. Still not sure which one to believe.
Regardless of which one is true, the bow is a great design, which is why it's still around all these years later. And Jim is a stand-up guy. I'm glad he's still making them.