Looks like that company went out of business though...no one wanted a muzzle loading upper.
CMMG at one time made a muzzleloading upper as well.
I'm glad we have a plan C and D already defined. We won't need it though...AWBs are DOA politically.
But before I would buy a pump action AR, I would roll with this. To my knowledge, it's legal in all fifty states as each magazine tube only holds 8 rounds.