Either 6.5 Grendel or 6.8 SPC will require a 7.62x39 carbine if you want to be able to use the magazine. 6.8 won't fit into a 223 mag. For the 6.8 conversion it works best if you get a 223 bolt and extractor for a 7.62x39 carbine and open it up to 0.422
I built a 6.8 with a 16.5 inch bbl. Neat little rifle, but the 6.5 conversion is easier.
HS precision makes the varmint stock for the CZ Kevlar, but it will require modding for the 7.62x39 bottom metal. HS doesn't offer any other stock with 527 inletting.
I am waiting to hear back from Bell and Carlson about a possible stock from them. Barring that, it looks like I'll have to find someone to inlet.
