Quote:
Originally Posted by n4zov
"IMHO, this would not be difficult to do in the M&P - basically a barrel, spring, and magazine swap, but somebody has to spend some money. An M&P in .22LR might be a better choice, although the price would likely be fairly high."
+1 A dedicated M&P makes more sense to me than a possibly finicky conversion unit. I have never liked the idea of field stripping one handgun to install a conversion unit and then having to reverse the process.
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Hard to see how the slide could be made to work. First, it's pretty heavy for a .22 LR blowback action, and the breach face has ejector, firing pin hole and extractor spacings that would beat any .22 LR barrel. Not saying it's impossible. There are some clever people in the world, but a reasonably priced, reliable conversion of the M&P platform without replacing the centerfire slide would be challenging. Far more feasible is a purpose built M&P full size .22, perhaps with a Ruger style bolt in a non-reciprocating ersatz slide (housing).