I've had one in the works for a couple years now. The build got stalled when we moved and I just haven't started on it again. The bolt is mostly done except for an extractor cut, and I have a barrel. I just need time and motivation to finish it. I should have less than $150 in the upper when it's done. I don't think they'll be many more of them since the ammo manufacturers say their 17hmr ammo isn't safe in semi autos.