What kind of action is the Mark X or Zastava M70?
Based on the '98 - but not a'98.
The bolt is very similar to my K98
Very similar, with the major exception being the shape of the bolt handle. 98's wouldn't accept scopes without some gymnastics, commercial versions do.
The receivers differ in that mine has more of the "H" shape w/o the cutout
The front bridge on a 98 is higher than the rear - in other words, they are
not on the same plane.
The front, and rear bridge on 98-clones,
are on the same plane (made that way for ease of mounting scope bases - which weren't really a consideration in 1898).
*
Mauser, thee Mauser, also built commercial actions - that's for another thread*