There was a guy importing these from Impulse Gun Barrels in Austria.
http://www.mdwguns.com/Imports.html
That kit on Gunbroker is a way high price compared to what MDW was selling them for.
But there was some blurb on his site a while ago that he got into a conflict with IGB in Austria - didn't like their business pracices or something. He also posted on Glock.com that he has some left over inventory that he's trying to move you might send him an e-mail:
[email protected].