Conversion Barrel
As I understand it...
Yes, there is a difference.
The conversion barrel is a match grade 9mm barrel that you put into an M&P .40 to convert it to 9mm. The other barrel is a match grade barrel that goes into an M&P 9.
So, if you have the M&P 40 and want to shoot 9mm, you need to get the conversion barrel.
BTW I wish I would have seen your post sooner as you found a great price. I just purchased the conversion barrel for my M&P 40 and paid $133. Don't forget, you will also need 9mm mags. Cheapest I have seen is from 44mag.com.
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