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Enhanced Firing Pin for AR-47 to Fix Light Primer Strikes

1148 Views 6 Replies 3 Participants Last post by  Thomas Lee, 
Thomas Lee
Hello All! I have assembled and AR-15 pattern rifle chambered in 7.62x39. I had a few light primer strikes on some TULA ammo which surprised me as I had no issues previously. So I did some research and got a stronger hammer spring. Didn't fix it. Then I came across this Enhanced Firing Pin at Windham Weaponry, a local gun manufacturer up here in Maine, and it was designed specifically for ARs in x39 to whack those stubborn commie primers. I just tried it today and it worked! It fired all the rounds that wouldn't fire before. Very happy for this cheap fix to my problem.

Cheers!

7.62 x 39mm Enhanced Firing Pin for AR15 – Windham Weaponry, Inc
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OP,
Is your chamber & bolt breech face of Type 1 or Type 2 configuration?

7.62x39 should be type 1.

6.5 Grendel should be type 2.

A simple measurement of the bolt nose to breech face will tell the tale.

In 20+ years,I've never required a longer firing pin to ignite 7.62x39 or 6.5grendel in my AR platforms.
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Thomas Lee
Not sure. However, the upper was sold as a complete package including the BCG chambered for x39. I guess I’m not saying it’s impossible for the manufacturer to have installed the incorrect one, but it’s not like I cobbled together the parts.
You must have been lucky on that front! It seems that others have had issues igniting primers since there is a product specifically designed for the issue.
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Have you checked firing pin protrusion & breech depth to clarify the configuration that you assembled?

My ArmaLite assembled upper has functioned flawlessly as designed.

ArmaLite ships ASC magazines for 7.62x39.
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Thomas Lee
I don't have the knowledge or tools to do the type of measuring that you are asking for. However, just to clarify, it fired almost everything I put through it. The only thing it didn't is some cheap tulammo, like 6 cartridges. And it also seemed that the primers were not flush with the casing, but were slightly farther in, which may have contributed to it.

The primer strikes from the old firing pin do not look light. They look just like my 223 ar15 strikes. This new pin strikes don't look any different to my untrained eye, but they worked.

Interestingly, for comparison, the AK47 strikes from my dad's rifle are much more authoritative than anything I've seen in the AR platform. A much deeper and wider strike.

I have a bunch of different types of mags: ASC, Duramag, Promag, ELander
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@Thomas Lee... As you probably determined with the "enhanced" AR-47 firing pin, it is very slightly longer than a typical firing pin to work with 7.62x39 ammo. "Slightly" as in only 0.03 mm, based on my measurements, after I pulled pins from a 7.62 x 39 Toolcraft and a 5.56 x 45 Toolcraft, just to measure from the same manufacturer.

The 7.62 x 39 measured at 83.25 mm vs the 5.56 x 45 at 83.22 mm. However, there are other slight differences in size and shape, as you can see in the two photos below. The biggest difference being the actual firing pin tip, which I suppose equates to a slightly deeper penetration at the bolt face.

If you look at the Toolcraft 7.62 x 39 description on any seller's website, it describes it as including the "enhanced" firing pin: Toolcraft 7.62x39 BCG AR15 Bolt Carrier Group

Again, both firing pins are from black nitride Toolcraft Premium BCGs; one in 7.62 x 39 and the other in 5.56 x 45, both new and unfired. More food for thought!!
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Thomas Lee
sigamore said:
@Thomas Lee... As you probably determined with the "enhanced" AR-47 firing pin, it is very slightly longer than a typical firing pin to work with 7.62x39 ammo. "Slightly" as in only 0.03 mm, based on my measurements, after I pulled pins from a 7.62 x 39 Toolcraft and a 5.56 x 45 Toolcraft, just to measure from the same manufacturer.

The 7.62 x 39 measured at 83.25 mm vs the 5.56 x 45 at 83.22 mm. However, there are other slight differences in size and shape, as you can see in the two photos below. The biggest difference being the actual firing pin tip, which I suppose equates to a slightly deeper penetration at the bolt face.

If you look at the Toolcraft 7.62 x 39 description on any seller's website, it describes it as including the "enhanced" firing pin: Toolcraft 7.62x39 BCG AR15 Bolt Carrier Group

Again, both firing pins are from black nitride Toolcraft Premium BCGs; one in 7.62 x 39 and the other in 5.56 x 45, both new and unfired. More food for thought!!
View attachment 461053

View attachment 461054
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Great thank you! Those looks just like my pins.
You’re right, it’s only a tiny bit longer.
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