Okay, I understand the Glock symbol, the 9x19, US and the State of Georgia (but not the P) ...

...so what is this '3D'?

View attachment 869844

I think the “P” indcates a Proof Test

 

According to a member, I think Mike-M, it has to do with the rifling and it's ability to impart markings on the bullet that can be used to identify a specific pistol for crime lab purposes. Here is an article I found online relating to the marking:

https://glockcollector.info/2017/08/26/roll-marks-on-slides-andor-frames/

The pentagon indicates polygonal rifling, which all Glocks use. A pentagon without a dot in the middle means the barrel is from grade 5 steel. Pentagon with a dot in the middle indicates grade 6 steel. Neither symbol has anything to do with +P and/or +P+ compatibility. For +P and +P+ info, see https://us.glock.com/customer-service/faq. The Austrian government eventually required the 3D in the oval, which replaced the pentagon symbols. NIST (National Institute of Standards and Technology) created a 3D ballistics database for research to positively identify bullets fired from specific barrels. The 3D database will help draw positive matches between a fired bullet and the barrel it was fired from. Barrels marked with a 3D are in the database. Ballistic experts can strategically identify the correct source, but it’s not 100% accurate. For more info about the database, see https://www.nist.gov/news-events/news/2016/07/nist-3d-ballistics-research-database-goes-live. It’s important to note that the evolution of these symbols should not be interpreted as there are issues with the components with previous marks.

 

So they've got my Gun Barrel DNA? That will probably change over time, as more rounds down the barrel will change the markings.

I guess criminals wouldn't think of aftermarket barrels.

 

you made my curious. Looked at my G19.5, it says 9/19, 3D, 5, and below that is says "AT" on the second line. Could someone decode that too?

 

That’s easy... Perfection

Yeah, I’m sure that’s one of the BS answers you’ve already gotten though.

 

AT means the barrel was made in Austria.

 

Never new that - thanks!

 

Barrel with 3D-in-circle means it was produced by 3D printing process.

 

Lol

 

...so what is this '3D'?

The 3D on the barrel means the "finger print" that your Glock barrel makes on a bullet has been recorded "for crime fighting purposes" and is in a law enforcement accessed data base. This means that a bullet fired from your 3D stamped barrel can be examined and traced back to you and your gun.

 

I though it may have been something to do with 3D chess.

 

My 48 also has the "3D" in a circle.

Curiouser and curiouser...

 

My Glock only says "2d" on it, which would explain why it shoots so FLAT!

 

From a thread in 2016, from Glock about the 3D stamp:

"Hi, It is the a new stamping that the Austrian government requires and over time the old stamping will be phased out."

 

Post # 3 explains the 3D in detail.

 

Why would the Austrian government require this stamp if it is going into a US government database?

 

Why would the Austrian government require this stamp if it is going into a US government database?

I would imagine Glock is pretty tight with U.S. law enforcement.

 

If the gun is made for US then it's going to have the US proof marks, etc wherever it is manufactured

 

Just a proof mark.

 

Easy. Just trade barrels, firing pin and extractor between guns and really confuse them with your guns fingerprint.

“says the bullet came from this gun, but the casing came from that gun. Hmmmm”

 

Easy. Just trade barrels, firing pin and extractor between guns and really confuse them with your guns fingerprint.

“says the bullet came from this gun, but the casing came from that gun. Hmmmm”

Aftermarket barrels takes care of it.

 

The brass can be checked as well.

 

I called up Glock before and asked what 3D and AT meant.

:dunno:After they told me I soon forgot...

Just ask tech support - they answer the phone pretty quick and they know.

 

The pentagon indicates polygonal rifling, which all Glocks use. A pentagon without a dot in the middle means the barrel is from grade 5 steel. Pentagon with a dot in the middle indicates grade 6 steel. Neither symbol has anything to do with +P and/or +P+ compatibility. For +P and +P+ info, see https://us.glock.com/customer-service/faq. The Austrian government eventually required the 3D in the oval, which replaced the pentagon symbols. NIST (National Institute of Standards and Technology) created a 3D ballistics database for research to positively identify bullets fired from specific barrels. The 3D database will help draw positive matches between a fired bullet and the barrel it was fired from. Barrels marked with a 3D are in the database. Ballistic experts can strategically identify the correct source, but it’s not 100% accurate. For more info about the database, see https://www.nist.gov/news-events/news/2016/07/nist-3d-ballistics-research-database-goes-live. It’s important to note that the evolution of these symbols should not be interpreted as there are issues with the components with previous marks.

From my article at https://glockcollector.info/2017/08/26/roll-marks-on-slides-andor-frames/

I hope this helps.

 

Looks like the data collecting interest is in more than just collecting barrel markings. They call it data "sets" case imprints from the breech face, firing pin prints as well as barrel marks on bullets. Not sure when this data collecting started I would guess somewhere around 2014.



Data Format and Meta Data page. For cartridge cases, our focus is on toolmarks generated by the firearm's breech face and firing pin.

For cartridge cases, the regions of interest include the breech face and firing pin. The respective data sets contain:

• three-dimensional topography data and two-dimensional reflectance microscopy images (ring light and 6 o'clock side light) of the breech face impression, which may include the firing pin aperture shear, and
• three-dimensional topography data and two-dimensional reflectance microscopy images (ring light) of the firing pin impression.

3D Topography of Breech face and Firing Pin Impressions


Download | Image info

Download | Image info
2D Reflectance Microscopy Images

Breech face impression (ring light)

Download | Image info
Breech face impression (side light)

Download | Image info
Firing pin impression (ring light)

Download | Image info
For bullets, our focus is on tool marks generated by the barrel's rifling lands. The respective data sets contain three-dimensional topography data of the land engraved areas.





Disclaimer: Please note that mention of brand names does not imply endorsement by NIST.

Forensic Science, Ballistics and Fingerprints and pattern evidence
NIST Headquarters

• Laboratory Programs
  • Physical Measurement Laboratory
    • Sensor Science Division
      • Surface and Interface Metrology Group

Contact

• Xiaoyu Alan Zheng
  alan.zheng@nist.gov(link sends email)
  (301) 975-4095

Project Status
Ongoing
Funding
U.S. Department of Justice's National Institute of Justice

Created August 11, 2016, Updated January 3, 2020

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Hw cn I d-lt ths, plnx? Kthankbai...

 

not sure the question. But the answer is more bourbon.

 

Hw cn I d-lt ths, plnx? Kthankbai...

How can I delete this, please? Thank you.

 

:couch:

 

What is the difference in grade 5 and grade 6 steel? My 26 has the dot in the pentagon.


Sent from my iPhone using Glock Talk mobile app

 

What is the difference in grade 5 and grade 6 steel? My 26 has the dot in the pentagon.

From a pistol perspective, it doesn't make any difference. Both support SAAMI spec +P rounds.

 

The 3D on the barrel means the "finger print" that your Glock barrel makes on a bullet has been recorded "for crime fighting purposes" and is in a law enforcement accessed data base. This means that a bullet fired from your 3D stamped barrel can be examined and traced back to you and your gun.

That, honestly, kind of sucks. Enough companies are harvesting data about us already.