Had my first FTF today. While running some steel cased TulAmmo thru a new build, one round was a FTF. Upon further examination, the unfired round felt lighter than normal, like there was no powder inside the case. Otherwise it looked like any other steel cased round. The bullet appears to be properly seated. The failure was definitely not caused by a light primer strike. Guess I'll have to pick up another box just to compare weights of different rounds. Otherwise, no issues as, like most ARs, this one eats everything and runs just fine. How often does a factory round fail to receive a powder load? Or could it have been a bad primer?