Just bought a brand new M&P 9c, with safety.
Cleaned it, lubed it, and ran 123 rounds through it, 50 Blazer Brass 115 FMJ, 50 Rem. UMC 115 MC, and 23 Fed. Champion 115 FMJ RN. The ammo is inexpensive range stuff I bought at Walmart.
I'm happy to report that the new pistol functioned 100%...