You need to take it to a gunsmith.
Simple as Pie. (or PI). Remove the buttplate screws and buttplate. Unscrew the buttstock Bolt, all the way, with a LONG screwdriver, remove the bolt and slide off the stock.
858 x 67
.cz was created in 1993.
429*2=858
33 inches/840mm with the buttstock extended and the standard A2 flash suppressor and standard buttstock.
A buttstock is a stock in a firearm located in the rear of the firing mechanism where one's shoulder is held while shooting.
CZ stands for the company that made the ring. A "CZ" can also be cubic zircon that is a man made gem/diamond.
some have larger blade screws( 6 inches long) inside the buttstock, remove the butt plate and it will be recessed inside, you need a long, large screwdriver.
858 429,2 143,3,2 13,11,3,2
30 percent of 858 is 257.4.
(780 / 858) * 100 = 90.91 %