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parts
Ammo's good and spring tension seems good.........hmmm? If possible you could measure the protrusion on the other gun and or the length of the firing pin one to another as well. Gauging headspace may tell you alot.
On the fail to fire rounds, could you describe the indentations on the primers? Does the strike imprint seem adequate or shallow? Do fired (in dad's gun) and fail to fire strikes (in your miscreant) seem similar?
Finally, I am not aware of old bolt v. new bolt styles, can you elaborate?
Best of luck with it.
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