Happened in the middle of a semi-spirited speed string of shots. Gun has ~5k rds through it with no problems, and was clean and lubed before this range session. Had maybe 150rds into it this session (all suppressed) before this happened. Never had a bolt bounce issue with it before, nor any issues going into battery. Looks to me like it fired OOB, but shouldn't have been able to have the hammer hit the pin this far out.
No damage to upper, bolt, or magazine, nor any other issues with ammo
Remington green box 147gr
Faxon 4.5" barrel
Spinta bolt
Heavy 9mm buffer (with weights)
Standard carbine spring
Gi trigger with standard springs
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Couldn't find the case head, case came out of the chamber nicely, bullet solidly lodged just ahead of the chamber. Single bullet only, no squib or low powered round before it.