I've shot the .22 WMR for a couple decades. IMHO, 26" is past the point of diminishing returns. 20" is fine. There was an article in one of the gun mags a few years back which, if memory serves (and as Grand has indicated) concluded that optimal length was 20-21"

Communists: I still hate them even after they changed their name to "liberals".
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My boss asked why I wasn't working. I told him I was being a democrat for Halloween.