The Interarms Mark X was based on actions made in former Yugoslavia by Zastava, not by CZ in the Czech Republic. I have a Mark X in .30-06 with a full length stock. I think I paid around $350 for it a few years ago (including the scope). The metalwork and bluing on mine is outstanding and fitting is on par with any other mass produced rifle. The stock has those ugly white spacers and a poly finish, but I guess that was the way rifles were supposed to look in the 60's/70's. As for accuracy it depend on your skills and what length you're willing to go to try and find out what ammo or handload your rifle prefers and what kind of modifications you're willing to try (glass bedding, shimming the barrel, free floating the barrel, etc.). My rifle will do 2-3" groups with Remington factory loads if I do my part and without any tinkering. I'm sure if I spend a bit of time on it I would be able to tighten the groups a bit.
Here's a pic of mine
Here's a pic of mine