Not sure FTF is correct but I had 2 rounds fail to fire in my G33 today. These are the only two I have ever experienced with any of my Glocks. The G33 might have 500 rounds through it, probably closer to 200. I looked at the primers on both rounds and it looked like a light strike on the primers. Now the real question is why? I stripped the slide when I got home and noticed a few small shavings of plastic in the firing pin channel, maybe from the spring cups. Does anyone have any ideas. I was shooting Speer Lawman RHT and Double Tap 125grn. I have also include an unfired case and a fired one in the picture.