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FNG here. I acquired a .357 Sig conversion barrel for my M&P 40 1.0 with the 4.25 .40 barrel. Will the factory recoil spring work with the .357 Sig cartridge?The conversion barrel is 4.25 as well.
 

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We have a M&P .40 and a .357 conversion barrel here that we got a number of years ago, works great with no problems in the least.
 
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