Here is the section:
"There was some slight backlash in the trigger (that is, sudden, free movement to the rear after the sear releases, allowing the trigger to slap against the frame at the back of the guard), but it did not noticeably move the sights as the striker went forward. Pull weight on a duty grade M&P auto is factory spec’d for about 6.5 pounds. I can’t find mention of the Pro Series M&P’s pull weight on the S&W Web site, but on my specimen, the digital Lyman trigger gauge measured the release at an average of 4 pounds, 10 ounces. In live fire, especially running at speed, it feels even lighter than that"
The Pro tested ran 4lbs 10 oz.
Take Care
Bob