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All the other cases looked normal. I'm not too familiar with the benefits of heavy buffers, I thought they were just used to slow down the ROF. I may get the BCM parts kit for now, but I'd like to go through with upgrading all my bolt parts, getting a new buffer and springs, and re-staking my gas-key to boot when funds allow.
Heavier buffers increase the TIME that it takes for the carrier to get moving, unlock the bolt and extract the case.
The timing of the AR is critical.
If you try to extract before the barrel pressure has dropped (when bullet leaves the bore), the case is still holding on to the chamber walls.
Read through my "how it works" thread again.
This is covered there.
It also could be soft brass or hot loads. The suggestions so far will simply allow your carbine to deal with the out-of-spec ammo, but clearly you have a situation of too high pressure for that brass. The pressure may be in spec but the soft brass can't handle it or it may be higher than spec pressure. Either way this is not good.
Given that other ammo worked fine I suspect your chamber is fine. You could try a throat reamer to ensure the throat and leade are properly dimensioned, but I'd just switch ammo.
Great advice. I would just tweak that to include 5 previously tested mags.For class I would suggest to replace these parts on your AR or have them with you if yours is already GTG:
5-new magazines
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