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Discussion Starter · #1 ·
So I've been having this problem with my PA-63 having an occasional failure to fire when firing DA. I've been testing it by firing it DA and then using the hammer-drop safety to drop the hammer and then firing again DA. It fails to fire about 10% of the time. I'd like to carry this gun, and that ain't going to work. It has never, ever, failed to fire on the second try.

I blamed it on the spring kit that was put in it, so I started going back up the ladder towards the factory mainspring. Before starting I tried installing a lighter firing pin ("extra power") spring but that didn't help. I get all the way back up to the factory mainspring and no-go. Still fails to fire occasionally.

This time, instead of just firing the misfires by giving it another pull I ejected them and inspected. There was no hit to the primer at all.

Hmmmm...so this means it just about has to be the firing-pin locking mechanism is out of spec and failing to unlock the firing pin occasionally? Do you think I'm on the right track here? I guess I'll have to look at that and see if i can figure it out.
 

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What does the strike look like on the primer of a round that did fire? Anything to see other than a regular firing pin strike?
 

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Discussion Starter · #3 ·
What does the strike look like on the primer of a round that did fire? Anything to see other than a regular firing pin strike?
Looks normal to me. Always fires SA. Strikes look the same whether DA or SA, when it does fire DA. I'm trying to wrap my head around the way the firing pin safety works.
 

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Have you taken the firing pin and springs out to examine them? While you're in there, check out the safety mechanism as well.
 
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Does it have a firing pin block like the series 80 Colt? Could the plunger just be worn enough that it fails to disengage completely sometimes? Never mind, that would affect single action as well.
 

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Discussion Starter · #6 ·
Have you taken the firing pin and springs out to examine them? While you're in there, check out the safety mechanism as well.
Yes, when I replaced the firing pin spring. It's got one of those firing pins that lifts up into firing position when the trigger is held to the rear, otherwise it tilts down at the rear and the hammer can't touch it.
 
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