Gun How To's_ Mossberg Mav 88 diagnose FTF issue

How to diagnose a FTF Failure To Fire issue on the Mossberg Maverick 88 12 ga shotgun. I include approximate measurements of the firing pin and FP spring. For exact tolerances I recommend you contact the MFG and request those call outs from their draft prints. May the odds be in your favor, Mossberg hates gunsmiths and customers who want detailed info on their guns, let alone replacement parts.