Ad hoc SF configuration
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Thread: Ad hoc SF configuration

  1. #1
    Carbineman Ghost's Avatar
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    Ad hoc SF configuration

    How many people here are using Mini-sized uppers w/standard size barrel lengths & gas systems?

    How many people are using 14.7" barrels w/pinned flash hiders?

    Just wondering how common it is.

    I've been waiting so long for any news about new developments from Robinson (like everyone else) and I am wondering whether to upgrade my XCR now or continue waiting to see if Robinson is going to come out with new stuff like improved barrels or a new upper design or finally get official word if the SF configuration as shown in pictures before is a go or no go.

  2. #2
    Marksman the tick's Avatar
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    Re: Ad hoc SF configuration

    Both my XCRs are mini uppers with standard length gas systems. One is a pistol with a 12" barrel and the other has a 16" barrel. Borth work fine. I've never fired or held a standard length XCR so I have nothing to compare the weight or balance.

  3. #3
    XCR Guru WatchoutforStobor's Avatar
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    Re: Ad hoc SF configuration

    Quote Originally Posted by the tick View Post
    Both my XCRs are mini uppers with standard length gas systems. One is a pistol with a 12" barrel and the other has a 16" barrel. Borth work fine. I've never fired or held a standard length XCR so I have nothing to compare the weight or balance.
    I'd love to see pics of the 12" if you have 'em. My first SBR would be a Mini with an 11" or 12" barrel with the short gas system (gas block moved back to the shortened forearm). All they have to do is make it.

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  5. #4
    Marksman Martens's Avatar
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    Re: Ad hoc SF configuration

    Got one ad hoc SF configuration. It is part of my patrol kit at work.

  6. #5
    Carbineman Ghost's Avatar
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    Re: Ad hoc SF configuration

    Does having the gas tube exposed make it fit more loose/wiggle more?

    Martens, what caliber do you use for your patrol XCR?

    I've been trying to decide which I ought to go for first... the shortened 14.7" barrel or the Mini upper. Which would make a more noticeable difference?

  7. #6
    Marksman Martens's Avatar
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    Re: Ad hoc SF configuration

    I run a .223. I don't notice any wiggle--it may be there, I just have never noticed. If you already have a full size upper, the 14.7 inch barrel is the bigger benefit as it removes the weight from farther out.

  8. #7
    Expert LurpyGeek's Avatar
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    Re: Ad hoc SF configuration

    Quote Originally Posted by Martens View Post
    I run a .223. I don't notice any wiggle--it may be there, I just have never noticed. If you already have a full size upper, the 14.7 inch barrel is the bigger benefit as it removes the weight from farther out.
    Just got a pinned 14.7 for my full size. Does change the balance quite a bit. I didn't weigh anything, but it felt to me like the barrel alone weighs about the same as the stripped aluminum upper.
    The above text may or may not represent the views of the XCR Forum, LurpyGeek, or various personalities contained therein. May not be reproduced without the express written consent of Major League Baseball. Keep out of reach of children. Consult a doctor before reading. May cause drowsiness, itching, apathy and vomiting. Do not resume sexual activity while operating heavy machinery. Thank you and good day.

  9. #8
    Marksman MadDogDan's Avatar
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    Re: Ad hoc SF configuration

    My SBR'd XCR has an 11" light profile barrel on a standard rifle length upper. I wonder how that same barrel would look on a pistol upper? Kind of like a "micro SF design"?

    MadDog



    WWJWD (What Would John Wayne Do)

  10. #9
    Marksman Martens's Avatar
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    Re: Ad hoc SF configuration

    IF you want to send me your barrel, I'd be happy to mock it up on my micro upper. I'd even put a few rounds down range to make sure it works as it should.

  11. #10
    Jack A Sol
    Guest Jack A Sol's Avatar

    Re: Ad hoc SF configuration

    you'd need the bolt carrier and gas tube from him too.

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