AK had a malfunction. AK firing pin related. - AR15.COM
Bent AK firing pin and punctured primers - Calguns.net
Typical Wasr shit. Firing pin blew out of the back of the bolt. Checked the retaining pin and it showed some unusual wear. Methinks the firing pin was able to slide back
AK-47 Firing Pin Retaining Pin
PSAK-47 Firing Pin and Retaining Pin Combo - 516444939 | Palmetto State Armory
Arsenal Firing Pin for 5.45x39mm and 7.62x39mm Bolts at K-Var