XCR L bolt wear question
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Thread: XCR L bolt wear question

  1. #1
    Newbie CFTOA's Avatar
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    XCR L bolt wear question

    Hey guys,

    Love my XCR so far - just had a small issue today I am curious about.. shooting my XCR, the barrel retention nut came a bit loose which I understand is a common problem when not torqued correctly.

    Just worried as there's some wear on the face of the bolt where it meets the 'tip' of the feed ramp, as well as on the chamber.

    View image: 20160120 134620

    Curious if the two issues are related and the wear is normal.

    Thanks for the help!

  2. #2
    XCR Guru Sean K.'s Avatar
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    Hard to tell from the pic, but looks pretty normal.

    200 inch lbs is what the torque spec is for the bbl bolt (though as high as 250 inch lbs has been posted by RA employees in the past)....however, I will sometimes snug it to 20 ft. lbs (240 inch lbs) just to be sure and if I only have that kind of torque wrench handy. I used to just gorilla fist it as I was told "you can't hurt it"....until I snapped the head off of the allen bolt. Drilling that SOB out is what made me decide to use the torque wrench instead.
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    Newbie CFTOA's Avatar
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    Quote Originally Posted by Sean K. View Post
    Hard to tell from the pic, but looks pretty normal.

    200 inch lbs is what the torque spec is for the bbl bolt (though as high as 250 inch lbs has been posted by RA employees in the past)....however, I will sometimes snug it to 20 ft. lbs (240 inch lbs) just to be sure and if I only have that kind of torque wrench handy. I used to just gorilla fist it as I was told "you can't hurt it"....until I snapped the head off of the allen bolt. Drilling that SOB out is what made me decide to use the torque wrench instead.
    Thanks for the reply - I have attached a few more pictures. there are no rough edges, just a 'polishing' on the crest of the feed ramp on the barrel as well as on the bolt where it meets that crest.

    Imgur: The most awesome images on the Internet

    Cheers!

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  5. #4
    XCR Guru Sean K.'s Avatar
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    Not something I'd be concerned about from those pics.
    "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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    Newbie CFTOA's Avatar
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    Appreciate the help. Had someone at an importer say otherwise so was rather confused. Just don't want any issues down the line.. id say I shot 20 rounds or so with the barrel nut unknowingly loose

  7. #6
    XCR Guru Sean K.'s Avatar
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    Quote Originally Posted by CFTOA View Post
    Appreciate the help. Had someone at an importer say otherwise so was rather confused. Just don't want any issues down the line.. id say I shot 20 rounds or so with the barrel nut unknowingly loose
    Importer? Are you in Canada?

    Either way, I've got bolts that look just like that and never had the bbl retention bolt come lose. Looks like normal wear.
    "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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    Newbie CFTOA's Avatar
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    Yup - but figure this is the best place to really understand what's going on!

    Imgur: The most awesome images on the Internet

    That was the picture the particular importer was worried about - but happy to hear all is well!

  9. #8
    XCR Guru Sean K.'s Avatar
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    ******


    Here's a couple of shitty cell phone pics of my x39 bolt with somewhere between 300 and 500 rounds through it. Pretty sure it's closer to 300.




    XCR L bolt wear question-cam00283.jpgXCR L bolt wear question-cam00282.jpgXCR L bolt wear question-cam00281.jpgXCR L bolt wear question-cam00280.jpgXCR L bolt wear question-cam00278.jpg



    Flash isn't working so the last pic shown doesn't show that most of the parking is worn off the flats on the bottom of the bolt lugs.

    What you got is normal bolt wear.

    If you're that concerned about it....buy another bolt. Spares are good to have anyway....they run about $125. Put it in and see if you get the same wear.

    If it's still shooting just fine, I wouldn't be at all concerned about it....but if you're that worried, send your pics to RA and see what the techs have to say.
    Last edited by Sean K.; 01-22-2016 at 07:42 AM.
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

  10. #9
    Rifleman owtlaw's Avatar
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    Nothing wrong with that bolt. Just add lube and have a good time.

  11. #10
    Newbie CFTOA's Avatar
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    Quote Originally Posted by Sean K. View Post
    ******


    Here's a couple of shitty cell phone pics of my x39 bolt with somewhere between 300 and 500 rounds through it. Pretty sure it's closer to 300.




    Click image for larger version. 

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    Flash isn't working so the last pic shown doesn't show that most of the parking is worn off the flats on the bottom of the bolt lugs.

    What you got is normal bolt wear.

    If you're that concerned about it....buy another bolt. Spares are good to have anyway....they run about $125. Put it in and see if you get the same wear.

    If it's still shooting just fine, I wouldn't be at all concerned about it....but if you're that worried, send your pics to RA and see what the techs have to say.
    Appreciate all the replies guys!

    My main concern wasn't with the bottom of the bolt, but where it meets the crest of the feed ramp.

    In any case doesn't seem like there's an issue! Thanks again

    Cheers

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