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how much velocity gain from polygonal rifling

Discussion in 'Handguns: Autoloaders' started by gofastman, Sep 21, 2010.

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  1. gofastman

    gofastman Member

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    how much velocity do you gain from it?
    the reason I ask is I'm curious how much velocity one would actually gain from a conventional rifled 6" barrel in a Glock 20.
     
  2. LawofThirds

    LawofThirds Member

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    Apparently...not much. The lone wolf barrels generally show about a 20 fps spread (either up or down) from the polygonal rifling.
     
  3. gofastman

    gofastman Member

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    are you talking about the 6" version of the LWD barrels or the stock replacement size?
    a 20 fps gain seems almost impossibly low :what:
     
  4. 9mmepiphany

    9mmepiphany Moderator

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    It does seem low, but remember that polygonal rifling is usually faster than conventional rifling (better seal, I believe), any velocity you'd gain from the longer length would first have to off-set that lost
     
  5. gofastman

    gofastman Member

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    anybody know the gain a Glock 6" barrel would give over the stock setup?
     
  6. usp9

    usp9 Member

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    The figure I've seen used is a 3% gain in polygonal barrels, however, not all barrels are equal. The quality and process of the machining varies greatly among both conventional and polygonal barrels. A match grade conventional barrel may be close to or as well sealed as a polygonal tube.

    Steven Camp wrote this Sig 225 test, in which he purposely compares it to a Glock of similar ilk. Excellent article. The comparison is near the end. The results seem to indicate that the polygonal does offer higher velocity, if only slightly.
    http://actionsbyt.blogspot.com/2008/05/stephen-camp-sig-sauer-p225.html
     
    Last edited: Sep 22, 2010
  7. Ben86

    Ben86 Member

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    The main benefit to me with polygonal rifling is easier cleaning. The fouling seems to scrub off noticeably easier with polygonal rifling. There is only a marginal increase in velocity (the manufacturers really exaggerate this too much). Better accuracy? There are so many other more important factors that effect accuracy I have a hard time believing it really makes a difference. It's more of a marketing ploy. I wouldn't feel more compelled to buy a gun just because it had polygonal rifling.
     
  8. gofastman

    gofastman Member

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    could you please clarify this a bit, its confusing as hell
     
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