Take it back to the range a few weeks later and I'm having similar issues. When I get home I pull the carrier and 2 gas rings are sheared off. Less than 600 rounds. Replace the rings and back to the range a few weeks later. Run another 400 rounds through it and when I get home the new set of rings are shot. On my 3rd set of rings in less than 1000 rounds. I'm guessing the primers blowing out is due to the bolt unlocking too fast. I check the unused carrier I have and when standing it up on the bolt face it will not stay extended. Makes me think there's a tolerance issue that's causing the bolt to unlock before pressures stabilize and that's what's blowing the primers out (I've only shot factory ammo at this point) so I send PSA an email.
I explain the issues I'm having and the issue with the new carrier and 6 days later I get a response explaining how carriers are consumables and basically I'm on my own.
I get that running an SBR with a short gas system can be violent on the bolt but these have been used exclusively in 16" mid-length systems. I don't know if I just got a bad batch of carriers but seeing as I can't really trust these I decided to upgrade.
In hindsight since I was using a BCM barrel and upper I should've just gone with their carrier to begin with. I settled on their Ion Bond FDE carrier. It comes with the upgraded extractor and I know if I do have an issue BCM will stand behind it. The machining on the BCM is leaps and bounds better looking than the others (at twice the price it probably should)
It cycles nice and smooth and any extraction issues and primer blow outs are non existent. I'll need to run a thousand or so rounds through it before I can say for certain it's a winner but so far so good.