A buddy of mine already got one. They're coming in with random black, green, or gray furniture. (It's easy to dye plastic black by boiling it in clothing dye.)
He took his in to the police station and had it registered as a handgun (don't ask, it's a Michigan thing).
There's a bill moving under the radar to make Class III stuff legal in Michigan. When that happens, he'll get a $5 "any other weapon" stamp, and put the stock 9" barrel on. Since he has a CCW, he can then legally carry it loaded on the front seat of his car.
If that happy day ever comes (Class III isn't forbidden in Michigan, the cops and the pols just say, "there's no law making it legal"), I'll shell out $5 for a stamp, and $250 for my 9" barrel.
Shootmoot II ... This time it's serious
Mmm.... shootmoot....