Yesterday, I got to the range right at dusk. We generally wrap up shooting outside when it gets dark, but this time of year, we squeeze in every minute of outdoor trigger time we can get. One of the guys I shoot with just got an MGM double swinger, so I had to try it out. After I got done shooting, one of the other guys that was watching us said that about every fifth round, he could see flash coming from my ejection port. When you look at my brass, you can see where gases are coming around the case a bit. The pistol is an M&P 40. The rounds that I was shooting are not very hot by any stretch of the imagination. How concerned should I be about this?