An interesting point, that I mentioned on the guild, but thought it would add over here... The Smart Parts Boss pump had cocker threads. Sort of. the breech was longer, and their barrel tip / muzzle monstrosity (weighing in at least about .5 lb) was cocker threaded. That's right, you could thread a cocker and a boss to the same barrel, at the same time. Wish I got a pic of that, it was kinda funny.
Its my guess that they wanted to sell some of their stock, and just took barrels and turned down the ends for their new gun. they weren't ported.. probably because the things ran liquid to get any sort of usable velocity.
Nice pump though, I sort of miss mine.