I have one in my P-10C. I loved everything about the pistol from the minute I started shooting it except the accuracy. Not that it was terrible just that I got better results from most of my other pistols. I finally decided try the Primary Machine barrel.
When I installed the barrel I was a little skeptical because the fit wasn't any better or worse that my factory barrel. Not that the fit was bad on the factory barrel I was just expecting the PM barrel to be a tighter fit. Boy was I surprised. Even before breaking it in the PM barrel dramatically reduced my group sizes. With five or six hundred rounds through it I can stack rounds on target at my typical 10-15 yard practice ranges.
For what it's worth I have fired other stock P-10 pistols that didn't have my accuracy issues. I refused to give up on mine because the trigger is amazing from the factory and I love the ergos and how flat shooting it is. I had dumped a lot of money into a first get M&P pro that had horrible accuracy even with an Apex barrel and various other upgrades. That pistol was just a dog.
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