As the title says, this is Frontier 62 gr. SP in 5.56. Primer fell out and completely locked up rifle. Primer got stuck between bolt and receiver, causing a divot that will clean up. The case has some marks on it as well. I have read a couple of reports of this happening to other people as well. The small piece @ 4 o'clock is the squished primer. I have shot a hundred or so of these rounds and this is the first problem with it I have had. I guess Lake City loads this stuff for Hornady. I am gonna send this to Hornady as well and let them know they need to tighten up their QC.