Substituting An AR-15 Firing Pin With A Modified Duplex Nail

This is awesome:

BAN NAILS!  Or at least require a background check and serial number registration system.

Handy to know that if i’m ever short a nail I can always head over to my AR-15. :P


Hat tip: Scott



"Dr." Dave July 12, 2012 at 12:15 am

Oh man thats a bad idea.


NikonMikon July 13, 2012 at 05:14 am

Why is it a bad idea?


thebronze July 12, 2012 at 01:23 am

This video just took 2 mins and 48 seconds to show how completely retarded Kalifornia gun laws are.


Frank July 12, 2012 at 08:23 am



Komodo Saurian July 12, 2012 at 04:31 am

Well, it’s hardly surprising that this guy could make a substitute. Guns aren’t exactly that complex. With proper tools any idiot can make his own home-made gun and in fact many do.

Here are some links. This is a zip-gun that fires Peas:

This is a scene from the movie “Brother 2”, this one fires nails:


Aaron July 12, 2012 at 06:58 am

huh… and they say “we don’t make anything here in America anymore.”


Brice July 12, 2012 at 07:00 am

It would probably be easier just to buff off the micro-stamping from the original. But machining your own gun parts is so awesome, I don’t care why they did it.


Jim P. July 12, 2012 at 08:16 am

Actually they were talking about this in New York as well. What a joke.


jpcmt July 12, 2012 at 09:57 am

If microstamping goes into effect, you have to police your brass so bad guys don’t take it at the range, then toss it on the ground at their next crime scene. Also, it’s technology that’ll never work.


BBJones July 12, 2012 at 11:12 am

A nail won’t last long as a firing pin and could be dangerous, but an interesting video.


Jim P. July 12, 2012 at 01:05 pm

The box of nails probably cost about $4. Then toss in that if you’re doing one, you can probably do a personal assembly line to do 10 or 15 at a time.

Add in that someone could change out the original pin for home made one for the crime and then back to the original for range time.

And as jpcmt noted your brass from the range could be used against you.


USSMunkfish July 12, 2012 at 12:12 pm

“That is dangerous because, something… I don’t know why but it is rabble rabble!”

–As long as you don’t let the pin protrude too far I don’t see a problem with this.


paul kimble July 12, 2012 at 01:59 pm

on the contrary it would be quite exciting if the pin protruded too far.


USSMunkfish July 13, 2012 at 02:44 am

Hah! I’m curious though, would it be catastrophic to puncture the primer? Would it just let some gasses out to erode the bolt face, or it it actually blow something up?


paul kimble July 13, 2012 at 08:24 am

i dont claim to be an expert but i suspect you’d be ok as long as the bolt made it into battery.


M July 13, 2012 at 10:09 pm

no different from a loose primer popping out i would suspect. Besides, all ar weapons blow some combustion gas back into the bolt area anyway.

a protruding pin would change it into an automatic weapon though, ala uzi. Everytime the bolt closed it would fire until it emptied the magazine.i supposed one could make a three round burst by loading unprimed brass every 4th round, then cycle the bolt manually…


Church July 12, 2012 at 03:17 pm

That was interesting. And I totally don’t understand all of the California gun law comments…


Jim P. July 12, 2012 at 03:40 pm

California passed a law that would require micro-stamping on all weapons sold after 1/1/10. It was pretty much DOA because it was so easy to defeat.. New York also considered it, but the big gun manufacturers basically told Albany “Pass it and we’re going to move — lock, stock and barrel — to a gun friendly state.” The idea was tabled.


dave w July 12, 2012 at 04:26 pm

And the guy running around telling everyone that this is the way to cure all gun related ills, is the guy who has the patent on the technology and would have to get very rich if they passed it.


thebronze July 13, 2012 at 01:08 am

Not exactly.

From June in the NYT:

In California, legislation signed by Gov. Arnold Schwarzenegger in 2007 has been held up while the attorney general’s office makes sure the technology is unencumbered by patents, as the microstamping law requires. A gun rights group, the Calguns Foundation, went so far as to pay a $555 fee to extend a lapsing patent held by the developer to further delay the law from taking effect.

“It was a lot cheaper to keep the patent in force than to litigate over the issues,” said Gene Hoffman, the chairman of the foundation, adding that he believed the law amounted to a gun ban in California.

Todd Lizotte, an engineer who developed the method in the 1990s, said he wanted the patents to lapse and the technology to be in the public domain.


Jayson July 12, 2012 at 04:12 pm

Time to start microstamping nails…..


EnfieldEM2 July 12, 2012 at 08:14 pm

My downstairs neighbor goes on and on about this little trick, good to know that he wasn’t just blowing smoke, but I think I will pass.


Michael July 12, 2012 at 08:30 pm

I actually came across one of these nails on the side of the road while walking home one day and said to my friend “Dude that totally looks like an AR firing pin”. Never thought about actually using one as a firing pin.

I’m sure with a little hardening these can be just as good so long as you’re using quality nails.


NikonMikon July 13, 2012 at 07:13 am

You encounter these nails in situations where you’ll have to remove them (temporary useage). The place I encountered them was building houses. They were used to nail the form boards together. Once the slab is poured, you have to break the forms down and the duplex head made it a lot easier to do.


Jeff July 12, 2012 at 09:08 pm

Lol, I just pictured Eugene Stoner designing the AR-15:
“Hmmm, firing pin, firing pin……” *looks at nail in his tool shed*
“This’ll do”


Jeep July 13, 2012 at 07:11 am

HA HA HA, I REALLY wish it happened this way, I picture him just like Homer Simpson now…


Heath July 13, 2012 at 10:43 am

Mike, no comment about wearing his safety glasses on top of his head???


Heath July 13, 2012 at 10:47 am

So does anyone know the Rockwell hardness of a duplex nail as compared to your typical factory firing pin?


BrowningBottoms July 13, 2012 at 12:44 pm

Where there’s a will, there’s a way.


AZRon July 13, 2012 at 02:26 pm

Damn I’m old. I still call ’em scaffold nails.

I haven’t done a Rockwell test on them, but I can verify that they are harder than my fingers.


confused July 14, 2012 at 01:26 pm

Why does he use a bench grinder when he has a lathe?


Paul Lepordo January 6, 2013 at 07:42 pm

100% American made wow amagine that (don’t tell Feinstein she will outlaw nails or impose a nail tax on them) they will cost as much as a carton of marlboro’s.
Beleave it or not we truly have some very competent gunsmiths and or rifle builders out there, these guys I mean the retired ones and the old school guys who still do things the right way, that know more about building guns than most builders these days have forgot, for instance Tim Mc Whorter, Kenny Jerrett, Mc Millian to say a few.
The knowledge and skills of these people should be put to use in advising and supporting the military on schooling these young guns out there building wepons for the goverment (if they would consider it for this administration)
But….I don’t really think the goverment wants to be told how to do anything ,infact they are most likely scared of these people because of the knowledge they possess
what a shame.



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