XCR-L Changes / Variations / Options - Page 3
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Thread: XCR-L Changes / Variations / Options

  1. #21
    XCR Guru Merlin's Avatar
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    Sounds more under gassed than over but if it ejects without failures I wouldn't worry too much about it. Just take everything apart, clean and lube it. Also check your buffer to see if it shows any strikes, if there are it was over gassed at some point.

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  2. #22
    Newbie omface's Avatar
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    Ok, I will. I had to replace the buffer once I first got it, haven't had any trouble with the new buffer. (About 350 rounds). Original owner said he only put 100 rounds through it and then it sat in his safe, he said the trigger slap bothered him to much. I was hoping it was just a break in issue but after that many rounds the break in period should be over

  3. #23
    XCR Guru Sean K.'s Avatar
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    Quote Originally Posted by omface View Post
    Thanks for all the info, I am working on upgrading my XCR-L(its approx a 2009). When I bought it, it already had the newer gas system (looks like a gen 2). After reading the posts here it says it may cause an over gassed gun. When I adjust the gas setting the brass ejects the same distance, about 10-12 ft, on all settings but S. Is this a symptom of an over gassed gun.
    10-12ft is normal and considered optimal by the owner's manual. I'm surprised it doesn't change with higher settings though. I'm wondering if your port sizes are wrong or your gas block isn't sealing correctly.
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

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  5. #24
    Expert Mechanic's Avatar
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    Gas tube holes down makes a difference as well. My 6.8 -L throws about thirty feet on 2, holes up.
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  6. #25
    XCR Guru Bravo's Avatar
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    Really!
    I've gotta admit, I never tried putting the holes up.
    What do you figure the difference is?
    Do you really think we want laws to be observed? We want them broken. There's no way to rule innocent men. The only power any government has is the power to crack down on criminals. When there aren't enough criminals, one makes them. One declares so many things to be crimes that it becomes impossible for men to live without breaking laws. Who wants law-abiding citizens? Pass the kind of laws that can’t be observed, enforced, or objectively interpreted - and you create a nation of law-breakers.

  7. #26
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    Quote Originally Posted by Bravo View Post
    Really!
    I've gotta admit, I never tried putting the holes up.
    What do you figure the difference is?
    Holes up, the default recommended position I believe, restricts the escaping gas by being very close to the upper, thereby retaining more gas in the tube. Holes down, the gas flows toward the barrel (no material in the upper in this area).

    I've tested this on my -L where it would eject on 2 holes up, but fail to extract holes down. Holes down on 3 functioned. It's not a huge difference, but it is there.
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  8. #27
    XCR Guru navalbeaver's Avatar
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    I've seen lots of barrels that have carbon build up on the top from the ports on the gas tube. Will have to double check the SBR that launches my casings and see where the holes are.

    Fwiw, the parts diagram on the robarm site appears to show the holes in a down position
    Last edited by navalbeaver; 04-03-2015 at 07:17 PM.

  9. #28
    Marksman Whiskey three six's Avatar
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    Mods, can we pin this thread ?
    No,,he's chaos, I'm mayhem,,,we're a duo act,,

    always looking for M96 stuff

  10. #29
    XCR Guru navalbeaver's Avatar
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    It has been

  11. #30
    Marksman Whiskey three six's Avatar
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    Type 1 gas valve adjustment , Overhead view of Type 1 gas valve, Type 1 gas system above Type 2, Type 1 and Type 2 bolts, Type 1 and Type 2 stock hinge ( viewed from the receiver end ).

    No,,he's chaos, I'm mayhem,,,we're a duo act,,

    always looking for M96 stuff

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