I save some of my spent or fired casings. I tear off a small piece of masking tape and put it over spent primer. I then put the spent casing in the breechblock, close the bolt and pull the trigger. I then eject the spent casing and examine the masking tape. It pretty well tells me if the firing pin is hitting the primer. The next time I am in a stationary store, I want to pick up a package of the small adhesive paper dots. I'm sure they will work better than the masking tape.
Peter
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