I had my first failure with my glock 19, but I'm thinking it was my fault. I was practicing drawing and then firing a round as quick as possible, and several times had the gun jam, but when I was pointing and shooting I never had a failure with the same ammo. I was using federal fmj 115 grain. I'm thinking I didn't have a strong grip, but would that cause a gun to jam? Any other ideas what could be the cause?