I just did this to my M40 and it works! Prior to the fix, my gun occasionally wouldn't extract Winchester ammo, either white box or Ranger 155 grain JHPs. Today, I went through 150 rounds of white box, 69 rounds of Ranger, 10 rounds of Blazer and five rounds of R-P/UMC with no failures to extract. Now I just have to change the Dillon over to .40 S&W and refill those cases.Ramshackle said:I took a little different tact and cut a 1911 plunger spring and put it inside the original Steyr spring, thereby stiffening it up. That solved the problem.