Bolt Peening on lug
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Thread: Bolt Peening on lug

  1. #1
    Newbie menzzer37's Avatar
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    Bolt Peening on lug

    Found some damage on on of my XCR-Ls this weekend. Started getting FRB issues and hard extraction. Then It started double feeding. Stripped it down and found the cam lug peened badly. Waiting on Robarms to get back to me about this. 1k through it. Ever seen this before?

    Bolt Peening on lug-20160131_151059.jpgBolt Peening on lug-20160131_151014.jpgBolt Peening on lug-20160131_151010.jpgBolt Peening on lug-20160131_150959.jpg

  2. #2
    XCR Guru Merlin's Avatar
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    New style bolt? Haven't seen anyone report this before, old or new.
    How is the rubber buffer?

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  3. #3
    XCR Guru Sean K.'s Avatar
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    What kind of coating are you running?

    To answer your question though....never seen peening like that one before.
    "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. #4
    Newbie menzzer37's Avatar
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    TiN. The rifle is a 2014. Buffer is fine...
    Sean K. likes this.

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    Newbie menzzer37's Avatar
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    My issues were passed along, but with no answer so far.

  7. #6
    XCR Guru Sean K.'s Avatar
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    Best wishes.

    JFYI....I emailed tech and it took about a week to get a response. They're hella busy.

    Please let us know what they say.
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

  8. #7
    Carbineman InVader's Avatar
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    Quote Originally Posted by menzzer37 View Post
    My issues were passed along, but with no answer so far.
    It probably wouldn't hurt to give them another call tomorrow. I think Holly was gone for a few days, but she should be back now.

  9. #8
    Expert Mechanic's Avatar
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    Quote Originally Posted by menzzer37 View Post
    Found some damage on on of my XCR-Ls this weekend. Started getting FRB issues and hard extraction. Then It started double feeding. Stripped it down and found the cam lug peened badly. Waiting on Robarms to get back to me about this. 1k through it. Ever seen this before?
    What does the ejector look like? From the pics it appears the bolt was rotated slightly during the feed stroke; the portion of the cycle when that surface is engaged. A loose or misaligned ejector could influence the bolt at that point.

    You may be able to true that surface (as well as it's mating surface on the carrier), but you will want to ensure the ejector is correct before dropping the bolt with any force.

    Edit: Also, what does the mag that was in use look like at the BHO area?
    Last edited by Mechanic; 02-04-2016 at 05:43 AM.
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  10. #9
    Newbie menzzer37's Avatar
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    I'll check out the ejector. Good though! I was using a Lancer mag. I'll look it over tonight> Thanks for the help

  11. #10
    Newbie menzzer37's Avatar
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    Got a new bolt from RobArms. I will try to get out and test this weekend in the frigid temps.

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