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Pentagon Marking on barrel (pic)

Discussion in 'General Glocking' started by GS19classified, Mar 2, 2010.

  1. GS19classified

    GS19classified

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    I checked the Glock FAQ page and could not find what this marking means . . . See photo

    any suggestions

    [​IMG]
     
  2. edge4628

    edge4628

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    Last edited: Mar 2, 2010

  3. RBL525

    RBL525

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    It is a marking showing the rifling of the barrel.
     
  4. Clownblaster3000

    Clownblaster3000

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    Except the Glock bore isn't pentagonal... :whistling:
     
  5. dabigguns357

    dabigguns357

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    could it be a some type of P/D or S/O marking.Mine says BCT on the top of the barrel,meaning Bexar County,Texas
     
  6. RBL525

    RBL525

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    Excellent point. I guess it is hexagonal.... i haven't really looked that close at the engraving. It is a pentagon..... that is just what i was told, i may have been wrong.
     
  7. DriBak

    DriBak GUNS UP Millennium Member

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    :popcorn:
    I have one with this marking also
     
  8. glockman9mm

    glockman9mm

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    All of mine have this marking.
     
  9. busadude

    busadude

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    my gen2 21 has it also
     
  10. dougader

    dougader

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    proof mark as posted above.
     
  11. theNAST1EST

    theNAST1EST

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    I'm nearly positive it just shows that polygonal rifling is used.

    Proof marks are different. They note that the gun has been test fired successfully with higher power loads. The US made Glocks don't have these proof marks, but the Austrian models have distinct marks.
     
  12. eaglesfan55

    eaglesfan55 (>'-')>

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    what would these marks happen to look like????
     
    Last edited: Mar 2, 2010
  13. RBL525

    RBL525

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    It is an eagle and NPv on the right side of the slide towards the rear.
     
  14. RBL525

    RBL525

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    Like this

    [​IMG]
     
  15. WGO55

    WGO55 Lifetime Member

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    I just checked two of mine, 30SF and 21SF. Both have the pentagon mark, but there is also a dot in the center of it.
     
  16. omega48038

    omega48038

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    It signifies polygonal rifling. Depending on caliber, some GLOCK barrels have hexagonal (6 sided) rifling, some have octagonal (8 sided) rifling. The stamp is a pentagon.

    All three are polygons, the general name of any closed shape made up of straight segments (triangle, square, pentagon, hexagon, heptagon, octogon, nonagon...).
     
  17. Fan45acp

    Fan45acp

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    I have the"MARK" on my gen.3 G27...
     
  18. DWARREN123

    DWARREN123 Grumpy Old Guy Silver Member

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    The mark of "GASTON".
     
  19. 1 old 0311

    1 old 0311

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    Made by Chrysler?:whistling:
     
  20. WGO55

    WGO55 Lifetime Member

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    Anybody else have a dot in the center of their pentagons?