The funny thing abut the "Bushmaster 17S" is that it started out here in Oz, in the fertile brain of one Charles Giorgio, later known as Charles St. George, who had previously "re-imagined" the AR-18 into the Leader Dynamics rifle, way back in the 1970s. That design subsequently had a brief rebirth as the AAA SAR.
The bullpup didn't get much beyond prototype stage here before the family bolted to the USAto start anew in a better environment.
I ran into the man himself, and some of the family, at a SHOT Show a few years ago. Nice folks.