Thanks for your review input drover. I have yet to see one in real life and mine won't show up until today sometime if the weather doesn't get to bad.
This should be a fun project. I'll first put it thru the paces as a 22lr and see if all the hoopla about CZ accuracy is true. grin Then I'll start building a 17HM2 barrel for it unless aftermarket barrels come down in price which I don't see happening. I'm shocked to hear that CZ used plastic pillars............why? Why not use aluminum pillars?! Those will get changed.
All in all I think it will be a fun project.

On a side note, the 17 Aguila 20gr. arrived and I'm looking forward to seeing if my Sako likes them.