The 6.8 XCR PDW thread! - Page 2
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Thread: The 6.8 XCR PDW thread!

  1. #11
    Marksman bolster's Avatar
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    Re: The 6.8 XCR PDW thread!

    Quote Originally Posted by stanc View Post
    Quote Originally Posted by bolster View Post
    Quote Originally Posted by TerraShrewsbury View Post
    1/11 twist on an 8" barrel? :dontknow:
    Sure. That twist rate with 4 grooves gets the best velocity and lowest operating pressures without sacrificing accuracy/
    1:11 twist may be optimum for a 16" barrel, but I'd expect an 8" barrel would need a significantly faster twist in order to stabilize the bullet.

    Here's a real world example: Some years ago a friend of mine shortened the 20" barrel of his M16A1 to 8" length. But, with the 1:12 twist, the bullets didn't spin fast enough, and keyholed in the target. I suggested he try again with a 1:7 twist M16A2 barrel. Problem solved.
    Yeah, if a 1:10 does it, on a 9" barrel, I'm good with that.

  2. #12
    Expert Col Maddog's Avatar
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    After a few years of waiting I finally pulled the plug on my 6.8 SPC PDW. It is a Mini with a 10" barrel. The form 1 to SBR it has been submitted. My 16" barrel XCR 6.8 had the original tube stock which I liked but I have since installed the new FAST stock on it which I also like. When I get the stamp back do I install the tube stock or the FAST stock on my mini?

    The 6.8 XCR PDW thread!-2014-01-04-12.00.33.jpg
    When the difference between life and death is a matter of seconds, the police are only minutes away!
    (not knocking police, just gun grabbers)

  3. #13
    XCR Guru TexasChris's Avatar
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    boy....you've been waiting a long time for this haven't you!?

    classic zombie thread!
    Do what you've always done, get what you've always got. ----- Have gun. Will travel.

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  5. #14
    Expert Col Maddog's Avatar
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    Yes, but I have been working on many other "fun" projects. Throwing mud to see how much sticks!
    When the difference between life and death is a matter of seconds, the police are only minutes away!
    (not knocking police, just gun grabbers)

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