20 cal Dewey rod for me.
Here's what CZ says about cleaning rods.
Quote:
Our 22 LRs use our cold hammer forged and lapped barrels, and are built a bit tighter than many other guns. In 22 LR we run a .211 bore, which is one of the reasons our .22s are known for incredible accuracy. This also means that a .17 or .20 rod and jag are required for cleaning, since a .22 rod will be too large.
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Also, a bore guide is helpful. Some 22's will scrape off the coating on a cleaning rod.