I just shot my brand new Glock 42 today. I happened to be at a friends house and only had the seven rounds that were in the gun. Which were .380 Estate ammo which has federal stamped on the back of the cartridge. Its what I picked up at the gun shop when I bought the gun a couple days ago. All seven rounds failed to eject. I have always thought highly of Glock and have shot many of there pistols and other pistols without issues. Never had an issue of having a limp wrist but I even confirmed my grip after the first couple rounds malfunctioned. I am going to try some different ammo tomorrow. Although I sold my ruger lcp to get this gun and my LCP ate every round I put in it with no problems. Have I made huge mistake of spending over 400 dollars on this gun? As of now I definitely don't want to trust it with my life if the time ever comes. If this is a gun that will only except certain ammo I hope there is a recourse in getting my money back and finding a gun I can depend on.