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#1 best overall choice: Ruger 10/22, Bought mine in 1967, and, thousands of rounds later, head shot kills on squirrels -- in t-a-l-l trees -- are almost guaranteed.
And there are more aftermarket accessories/mods for the 10/22 than for 'most any other rifle.
or
Yep, those are all the same .22 rifle!
nice set up! Thanks!