My Glock 31 kabooomed , shooting PMC ammo. I got rid of the G31, but still have a 17 and a 37. Glock chambered for 40 S&W have a bad record. The Glock 40 S&W chamber is not only fully supported , but is 5/1000 OVER sammi specs. However, stick with Fed, Win or Rem factory ammo, and the 40 S&W will likely serve you well.