Pennsylvania Firearm Owners Association
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  1. #1
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    Default New Glock Barrel Markings

    Hey everyone, I just bought a NIB Glock 23 Gen 3, I noticed it has new markings on the barrel that are unlike the markings on my old glock which was also a gen 3. On the barrel hood there is a [.40 (Pentagon with dot in center)] and also the Glock logo has a stamp (AT) to the right of the logo. also the mags have a "2" and have different cut outs to lock into place. Anyone has some insight to what these markings stand for?

  2. #2
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    Oct 2009
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    Pocono's, Pennsylvania
    (Lackawanna County)
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    Default Re: New Glock Barrel Markings

    The cuts on the mags are for gen 4 compatability. On the gen 4's the mag release is switchable from side to side so the mags need to be notched on both sides. Not sure what your barrel markings are as I never really looked into it.

  3. #3
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    Default Re: New Glock Barrel Markings

    Pretty sure the pentagon means Glock polygonal rifling. No sure about the rest.
    Cb

  4. #4
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    Default Re: New Glock Barrel Markings

    Thanks! i figure ithe pentagon was a reference to the polygonal rifling, and thanks for the info on the mags, I will have to keep researching the AT ( which might be "Austria") from what i have been reading in other forums.

  5. #5
    Join Date
    May 2007
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    Glenside, Pennsylvania
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    Default Re: New Glock Barrel Markings

    This thread says the pentagon indicates the grade of steel. Also, it says if there is a dot in the center it indicates more chamber support.

    thefiringline.com thread

    My Gen 4 G23 has a dotted pentagon.

    (I haven't heard one way or the other officially from Glock.)

  6. #6
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    May 2010
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    Default Re: New Glock Barrel Markings

    Wow I would love to talk to a glock rep, if that is true about the "supported" barrel and steel type that would be awesome cause ive been looking at buffalo bore .40 S&W +P ammo, but it can only be fired out of supported barrels.

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