I have been looking but am unable to find what (if any) spec there is on how much the firing pin should protrude from the bolt face on an A5. My feeble memory says about .050 but I can't find it anywhere. Can someone help me on this issue? Thanks

I tried to measure for you but found it’s just about impossible without taking the bolt out. It looks like half of a #8 pellet sticking out, so .050” would be in the ballpark. My unreliable results said .030”.

I check firing pins by putting a piece of electrical tape over a snap cap primer and checking for a hole after dry firing.

Thanks for trying Rudolf. Randy posted generally .055-.065 for shotguns.

That's the general standard in the industry.

Brownells

"As a general rule, [pin protrusions for] centerfire rifles and handguns usually measure between .050” and .060”. Shotguns are a little longer at .055” to .065”. Rimfire guns usually fall into the .028” to .035” range. However, inertia-type firing pins, the slanted pins in over-and-under shotguns, and many other designs will provide exceptions to these generalized guidelines."

Art and his boys are the "Auto-Five" kings and can tell you what they consider proper. https://artsgunshop.com/