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Thread: Barrel worn out?

  1. #31
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    Quote Originally Posted by Robb Jensen View Post
    I'd recommend pulling the flash hider off and cleaning all the carbon out of ii and cleaning the barrels crown. I'd also clean the bore with JB bore paste and then WipeOut-PatchOut copper remover along with their WipeOut-PatchOut accelerator.
    Exactly what I would do. If it is shot out then a very aggressive cleaning cannot hurt it. My bet is that acceptable accuracy returns

  2. #32
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    Clean the barrel thoroughly before replacing it. Use solvents for removing both copper and powder fouling. I have made a few bad shooting rifles shoot a lot better after a thorough cleaning.
    Train 2 Win

  3. #33
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    Quote Originally Posted by T2C View Post
    Clean the barrel thoroughly before replacing it. Use solvents for removing both copper and powder fouling. I have made a few bad shooting rifles shoot a lot better after a thorough cleaning.
    Yep, cleaned old barrel thoroughly with lots of greenish residue coming out on the patches but still had accuracy issues. Can't take the flash hider off to clean the crown as it's pinned to meet the 16" OAL.

    A new barrel from LMT solved all the problems and now it shoots like a laser beam again, even groups well with the 55grn M193.

  4. #34
    wtheesfeld Guest

    Barrel worn out?

    Can I have your old barrel

  5. #35
    Dano5326 Guest
    IMO likely-hood of issues, at that rd count, with a quality barrel.

    1) fouling/obstruction at muzzle device
    2) carbon build up IVO throat
    3) throat erosion
    4) excessive copper build up

    Personally, I rarely clean barrels, time better spent on trigger. When I do, prompted by groups opening at 300m is the indicator. 50-100M groups may not show the spin "taking". My priority is carbon, then copper. Then a mag to re-foul.
    If one has limited range facilities and pays for ammo your priorities may differ.

    I have a krieger barreled, middy, 16.5" recce upper, a few thousand rds through it, never more than a bore snake. 10rds mk262mod1 all touching at 101m last zero verification.

  6. #36
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    Quote Originally Posted by hkusp View Post
    I've put about 6500 rounds through my AR in the last three years. Barrel is LMT chrome-lined 14.5", 1/7 twist. It used to shoot 2-3MOA groups @100 yds with 55grn ammo, now rounds are scattering all over the place in about a 8" circle. After cleaning the gun I benched & rested it on sandbags yesterday, and with match grade 69grn ammo got sub-MOA groups. I tried the 55grn again and got flyers all over the place again.

    So, is the barrel done & dusted or is there anything that can be done to make it work with lighter bullets? I've still got about 1K rounds of 55grn that I'd prefer to shoot rather than sell to get expensive match grade ammo.

    It could be that the barrel is worn to the point that it will not stabilize bullets with shorter bearing surfaces. 6000 to 6500 rounds is about the point at which I replace a barrel on a match rifle, but my carbine barrels usually last 10,000 to 12,000 rounds.

    I had a 1:9 twist LMT 16" light weight barrel make it to 10,000 rounds before I replaced it, but I did not perform a lot of mag dumps with the carbine.
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  7. #37
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    Quote Originally Posted by T2C View Post
    but my carbine barrels usually last 10,000 to 12,000 rounds.
    Wow. I've never had a barrel give up the ghost that quickly.
    "You people have too much time on your hands." - scottryan

  8. #38
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    Quote Originally Posted by markm View Post
    Wow. I've never had a barrel give up the ghost that quickly.
    They are still safe to shoot, but do not meet my accuracy expectations.
    Train 2 Win

  9. #39
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    Quote Originally Posted by T2C View Post
    They are still safe to shoot, but do not meet my accuracy expectations.
    I see. I have an old one I swear has to have about 30k based on when I used to track the round count on the Silencer I got for it.

    I'm going to have to shoot that one on paper to see if it's a 4 MOA train wreck this weekend.
    "You people have too much time on your hands." - scottryan

  10. #40
    Dano5326 Guest
    7500-10000 rds is a reasonable expectation for a mil-grade chrome lined shorty on a rigorous institutional firing schedule.

    10-12k with less heat build up and wear.

    Use bimetal ammo, frange, and other specialty o questionable ammo... and who knows.

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