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Trigger systems and firing pins

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Dan W:
Never heard of this before. Can you be more specific about the modified firing pin?

Where was the collar shortened and how far does it protrude from the bolt face when the bolt is in firing position in the carrier?

Compare that to the original firing pin's protrusion.

If the firing pin sticks out too far, there is a possibility that it might be able to fire out of battery or even slam fire

RobertH:
just a question... is the firing pin an 7.62x39 or a standard ar15 firing pin?

Lmbass14:
Really good questions.

Bob - If the firing pin was too short, why did it work with the Wolff spring?  Originally that told me it wasn't the firing pin.

tst - Great thought and no, didn't try (and don't have) an extra bolt.  And to be honest, didn't think the bolt could be the issue. The head space was tested, and it was a go. 

Dan - Now you going to make me find the calipers that was put in a "safe" place.  I'll have to get back with you on that one.  You did bring up a good point about slam firing.  Didn't test the modified pin with brass ammo.  Need to do that.

Robert - The original one was 7.62 firing pin, going to ask my Brother on the modified one.

shooter:
 maybe the wolf spring hit the firing pin hard enough to fire the shell. by bouncing the firing pin,  how big of a dent were in the cases that didn't fire?

  and a second question, why did you try to make a AR-15 fire 7.62-39? there are already a load or AK,s out there that fire that case with no problem?

   and will I be taking the rifle to the gun shows in the fall?

Lmbass14:
Since Dan force me to find the calipers since the move, guess this needs to be updated.

The original fp is 3.185" and the modified one is 3.225".  Couldn't get the calipers to get an accurate measure on the protrusion of the fp, so had a sharpie and marked it, then measured the mark.  And that measurement of the original was .041 and the modified was .043

Here are some pics showing dimple and primer depth.

Golden Tiger



Wolf



Herters



Tula



Bob -  will keep this one, might give you a M44 to sell though.

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