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A 10/22 in 5.7x28 would be an awesome coyote/armadillo rifle. Except for ammo cost.
@valleyforge I agree, a 10/22 in 5.7 sounds totally feasible, considering the plethora of .22 WMR rifles from Ruger's competitors. The bolt thrust of 5.7 is a little higher on the account of the larger case head (if fluted), but P90 is a pure blowback and works great. If not 10/22, Ruger could make a version of PCC that takes 57 mags.
I called it