The adjustable stock extension will likely have to be custom made and installed. I would like a few of them myself, as my rifles (with extended stocks) are way too long for my sons to shoot them comfortably. I have seen a few of them on various ranges. Not sure who built them.

All the newer CZ527's I have seen had 1:8 stamped on the barrel. Not a trainsmash, as they seem to handle the 50 and 55gn bullets very well. If yours is indeed rifles with a 1:9" twist rate, it shouls still work well with both light and heavy bullets.

Not to bash the make, but the 223 Howas with the newer 1:9" barrels seem to dislike any bullet under 60 grains. They shoot very well with 77gn bullets.