Sprinco Buffer Spring & Rod

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Personally, I have no experience with it. If you do a Google search, you will find several forums.
 
As far as for an M&P, save your money.
What problem are you trying to solve?
 
I have 40K rounds on my 9mm Core, still has the original recoil spring, I have a spare in my range bag that is collecting dust. To me this proves that the flat wound springs are markedly better than the round springs. I've never had a coil spring last this long. I've considered using the Sprinco "recoil reducing" spring a few times, but then I reconsidered and didn't want to mess with something that (for me) was a non problem.
 
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