I would think the ruger 10/22
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The Marlin 60 has to be a close second but there is no more popular 22 rifle platform than the 10/22. The availability of aftermarket parts proves that point. You can actually build a 10/22 with no factory Ruger parts involved. Kinda like building a Harley from the frame up with no HD factory parts .1022 and the Marlin