Pennsylvania Firearm Owners Association
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  1. #1
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    Default Glock barrel question/observation

    Is it me or are the grooves in a 9mm Glock 17 barrel much more shallow than other barrels from other 9mm pistols?

    Am I imagining this? Or are the grooves actually more shallow?

    If so, I'm guessing the mindset is much like with marlin using shallow grooves for less bullet deformation and hopefully better accuracy.

    -Zach

  2. #2
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    Default Re: Glock barrel question/observation

    Is this your first gun with polygonal rifling? Just curious...

  3. #3
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    Default Re: Glock barrel question/observation

    rifling.jpg

    Glock barrels look like B.

  4. #4
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    Default Re: Glock barrel question/observation

    Quote Originally Posted by TooBigToFit View Post
    Is this your first gun with polygonal rifling? Just curious...
    Yes it is apparently.

    -Zach

  5. #5
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    Default Re: Glock barrel question/observation

    Quote Originally Posted by frankski View Post
    rifling.jpg

    Glock barrels look like B.
    Thanks for the visual. At least I recognized that it wasn't conventional rifling.

    -Zach

  6. #6
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    Default Re: Glock barrel question/observation

    Quote Originally Posted by frankski View Post
    rifling.jpg

    Glock barrels look like B.
    Barrel B looks closer to standard rifling than my CZ-82 with polygonal rifling. Looking down the barrel it looks like a smooth bore.

    Are Glocks somewhere in between?
    Last edited by Delkal; November 10th, 2017 at 10:15 PM.

  7. #7
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    Default Re: Glock barrel question/observation

    Quote Originally Posted by Delkal View Post
    Barrel B looks closer to standard rifling than my CZ-82 with polygonal rifling. Looking down the barrel it looks like a smooth bore.

    Are Glocks somewhere in between?
    The left illustration of B is a more accurate depiction of polygonal rifling than the illustration on the right. Polygonal rifling actually looks more like shallow waves.

  8. #8
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    Default Re: Glock barrel question/observation

    Quote Originally Posted by zachomega View Post
    Yes it is apparently.

    -Zach
    I hope that didn't come off the wrong way. I sometimes sound like a jerk when I don't mean to.

    In any case, if you're curious, polygonal rifling is supposed to improve durability (since there's no sharp edges on the rifling to wear), velocity (since it forms a tighter seal around the bullet, and the grooves are smaller which means fewer gases escape), and some say accuracy. Some will also say that you shouldn't shoot non-jacketed lead in a polygonal rifled barrel, as some say that lead more easily builds up in polygonal rifled barrels, which causes constriction over time and a catastrophic failure (kaBoom). They are most often found in HK and Glock handguns.

    ALL of that (except for being found in HKs and Glocks) is debated to no end on the Internet. People will argue that the velocity is not tangibly different, that the accuracy difference doesn't exist, and that you'll never shoot enough to wear out a lands-and-grooves rifled barrel. You'll also see people saying that you can shoot lead bullets out of polygonally rifled barrels.

  9. #9
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    Default Re: Glock barrel question/observation

    Quote Originally Posted by TooBigToFit View Post
    I hope that didn't come off the wrong way. I sometimes sound like a jerk when I don't mean to.

    In any case, if you're curious, polygonal rifling is supposed to improve durability (since there's no sharp edges on the rifling to wear), velocity (since it forms a tighter seal around the bullet, and the grooves are smaller which means fewer gases escape), and some say accuracy. Some will also say that you shouldn't shoot non-jacketed lead in a polygonal rifled barrel, as some say that lead more easily builds up in polygonal rifled barrels, which causes constriction over time and a catastrophic failure (kaBoom). They are most often found in HK and Glock handguns.

    ALL of that (except for being found in HKs and Glocks) is debated to no end on the Internet. People will argue that the velocity is not tangibly different, that the accuracy difference doesn't exist, and that you'll never shoot enough to wear out a lands-and-grooves rifled barrel. You'll also see people saying that you can shoot lead bullets out of polygonally rifled barrels.
    You didn't sound like a jerk. You answered my question with another question.

    -Zach

  10. #10
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    Default Re: Glock barrel question/observation

    Yeah, to me they look more ilke someone twisted the barrel. Supposed to make a tigher seal between the bullet and the barrel yada yada yada....all it really does is keeping you from shooting lead. I will say my poly AR15 barrel seems far more accurate then any other AR i ever shot.

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