Polygonal Rifling - Pros and Cons

Discussion in 'The 1911 Forum' started by DGG!, Feb 22, 2011.

  1. DGG!

    DGG! New Member

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  2. JLA

    JLA Well-Known Member

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    because some types are better... Polygonal is great, but so is precision cut, and precision cut can be done in any twist rate desirable and produced at a cheaper price.

    A $10k PSG-1 marksman rifle with polygonal rifling will consistently put 5 rounds into 1 MOA at 100 meters. But so will a 1200 dollar rem 700 sendero with conventional cut rifling, and they both shoot the same round, and the sendero may even do it at 1/2 MOA...
  3. DGG!

    DGG! New Member

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    JLA - That interesting. If the preciision cut rifling is cheaper to produce and is as good or better, I wonder why anyone uses polygonal rifling. Is it a reliability issue? After 25,000 rounds is the cut rifling barrel shot out?

    Is one more susceptable to fouling faster?
    Last edited: Mar 1, 2011
  4. JLA

    JLA Well-Known Member

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    Polygonal provides a perfect seal and facilitates the use of the HK semiauto designs where the rifle uses the gasses within the barrel to 'float' the spent round out of the chamber on a channel of gas pressure.

    The few polygonal barrels i have experienced with are very easy to clean.

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