I tried adjustable rings first when I shot at 300 yards. Worked ok, but a fair bit of work and test firing to set up for one specific range. Then I tried a budget adjustable rail and didn't like it. Then I got a MOAB that cost nearly as much as the second hand CZ.
The MOAB allows me to practice at 100 or 200, then crank up the elevation to further out on a range.
Regards
JCS