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I have a new M&P full size .40 that has never been fired, except once at the factory. The date is 3/28/06 and the serial # is MPBxxxx, so it is one of the first ones. I have heard that there were issues with the earlier guns, the current ones have upgrades, and that if I have problems, I can send it in and they will do upgrades. Were the # MPB's included in the problem guns, and do you know what the upgrades were?
 

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u can look inside of dust cover(just above the rail), and if it says "REV N", then its the modified one is what i was told. as for what was the addition was - see the link above
 
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