Now with the "break in" bullshit, my 5.56 AR I had absolutely no problems with. Mossberg MMR, out the box, shot .223 cal and 5.56 mm interchangeably without a hiccup. I just lubed it up and treated it like a $2 whore. No problems.
The DPMS AR10, like I said, less than 20 rounds of 7.62x51 and it was jamming like Bob Marley after smoking two spliffs.
I ran .308 and 7.62 through it, first two times at the range, same shit. Couldn't make it through 60 rounds without a malfunction.
Today though, third time taking it out, acted like a perfect princess. Sucked me off and massaged my balls without gagging. I put 100 rounds through with absolutely no problems. I only wished that I had brought more ammo.
So, do all higher caliber rifles need more "break in", or what the fuck was that?