I have the big brother (M&P 15) and was also seriously considering the 22. However, at around $500 it takes a lot longer to get payback than if you got a Ciener adapter. I simply don't shoot the AR enough to justify the additional outlay. Would rather use the money for another Scrap Yard purchase....
I would feel the same way but I don't own an AR at this point. I have been shooting 308 and its EXPENSIVE right now. looking for cheaper gun fun.
