Before i'd build a dedicate .22LR upper. I'd rather just build me another complete .308 and actually have a "tack driver".
.22LR is meant to be cheap and fun. Which is why s&w designed it the way they did. Also, the pressure of a .22LR is no where near that of the 5.56, .300 ACC or .308. So why even waste the extra money building it in aluminum. If ur going to do that, why not just build it out of Titanium and say u have a l33t .22LR.
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