For a .17HMR or .22WMR I would still go with the Burris Timberline 4.5-14x32 AO.
When I checked the AO focus scale against my rangefinder, they both agreed exactly out to 100 yards. I haven't see that on the Chinese scopes I have used.
I probably have 3000 rounds through that CZ 452/Timberline combo and the scope holds zero.
As per a previous comment about a CZ 452 needing a new trigger, that's probably because not enough shots have been taken. The CZ trigger is adjustable and it smooths out after a few thousand rounds have been fired.
Best way to improve a CZ rifle is to use it. All 4 of mine have gotten more accurate the more I use them.
It is always a good idea to check things over before using a gun. A little polish here, a little polish there. If you expect it to get better on its own, you are going about it the wrong way.
Actually, all you need to do to a CZ is clean the barrel, keep the screws snug, and give it a little lube where it needs it. It's well known among CZ users that about the only big difference between a CZ and much more expensive rifle is the finishing stages. With use, the action and trigger smooths out very noticeably as it polishes itself through use.
I lap the barrel with bore paste if it needs it, but that step is part of normal cleaning for me. Also, a CZ rimfire is available with a single set trigger, so that option makes more sense than an aftermarket trigger for most people.
Actually, all you need to do to a CZ is clean the barrel, keep the screws snug, and give it a little lube where it needs it. It's well known among CZ users that about the only big difference between a CZ and much more expensive rifle is the finishing stages. With use, the action and trigger smooths out very noticeably as it polishes itself through use.
I lap the barrel with bore paste if it needs it, but that step is part of normal cleaning for me. Also, a CZ rimfire is available with a single set trigger, so that option makes more sense than an aftermarket trigger for most people.
Just a quick correction, a CZ rimfire is available with a "SWEET" single set trigger. And yes, they do improve with use, both trigger pull and group size. The single set doesn't seem to change at all (it's just so good to begin with) but as FAL Shot said, after a few thousand rounds the stock trigger does improve itself. YoDave also sells a trigger kit that makes a stock CZ trigger break at 1.5lbs and break very clean as well, if installed right it eliminates creep completely. Add J&P striker springs and... dang! You got yourself a laserbeam critter gitter!
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