Hello, I hope that I can help. I am an accredited gunsmith in southern Alberta. A client brought me an Axis in .223 Rem with exactly the same problem. Inconsistent firing pin indents on the primer, thus misfires. Upon very close inspection of the bolt fully disassembled, I notice drag marks on the firing pin at the point where it passes through the 1/4″ cross pin which secures the rotating and fixed bolt heads. I checked firing pin runout on my lathe at the point where is passes though the cross pin. This measured 0.095″. The hole through the pin measures 0.105″ this allowing a 0.010″ clearance. The firing pin runout measured 0.013″ with a digital dial indicator. This would then mean a 0.003″ interference which can cause the drag marks and restrict proper striking. I opened up the cross pin hole from 0.105″ to 0.147″ using a carbide #26 drill bit. The client has reported back to me and indicated that a dozen rounds did not show any more problems. The cross pin is actually a very loose fit. When pressure is relieve from the wave washer, the pin can drop out on it’s own. As such, if the pin is not perfectly lined up center of bore, it can cause interference with such a small clearance of 0.010″. Furthermore, the pin being such a loose fit, can rotate again causing interference. As a side note and warning to do it yourself guys. The drill MUST be carbide as the pin is hard, standard tool steel bits may not cut it. And it’s a precision job, the original hole must be perfectly centered in the vice jaws. I use a milling machine to do this job and not a drill press and certainly not a cordless. Good luck.