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Thread: AR15 Barrel Inspection w/ Video Articulating Borescope

  1. #11
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    button rifled?

  2. #12
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    The chatter marks are the first thing I noticed as well, mostly because I have no idea what any of the other potential wear things look like - erosion...

    Try some CopperZilla. Run a wet patch down the barrel and let it sit for 10 minutes. Then have fun pulling nasty green patches out for the next 10.

    Be interesting to see the difference between a CHF barrel and a Chrome lined stainless.


    ON EDIT - After thought. I don't wonder if it would affect the accuracy removing any buildup in the chatter marks down the bore. They are just going to get loaded up again. Moly coated rounds maybe?
    Last edited by Sticks; 02-07-12 at 04:25.
    Sticks

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  3. #13
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    AR15 w/Borescope

    Looks like my last Colonoscopy..LOL

  4. #14
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    Nice shots.

  5. #15
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    I would be really interested in seeing the comparison of this to a Hammer forged barrel. How the tool marks look, etc.

    Either way, very cool.

  6. #16
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    Quote Originally Posted by drrufo View Post
    Looks like my last Colonoscopy..LOL
    If your colon had a twist rate.... Problems.

  7. #17
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    Great stuff-- nothing like shrinking ones self to 1/8" height and then exploring the cave that is your gun barrel! Thanks for posting that.

  8. #18
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    Those pics of the bolt face..Is that crud on the bolt face or is it pitted? I can't really tell....
    There's a race of men who don't fit in, A race that can't stay still, So, they break the hearts of kith and kin, and roam the world at will..

  9. #19
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    Gas port erosion is normal, they all have it.
    Chatter is caused partially by pulling the button through and partially from honing of the bore. Most all AR barrels have the chatter marks unless the bore is lapped like most match grade barrels.
    Believe it or not the chatter itself does not effect accuracy, I have seen barrels just like these that will shoot under 1/2" groups and some lapped match barrels that will not shoot under 3/4".
    There are other things that effect accuracy more than the finish in the barrel. A straight hole is one thing, a good crown, a chamber that is concentric and proper stress relief is more important than the finish.
    Just because the barrel is lapped doesn't mean it will shoot better. I have seen a ton of "match" barrels that don't have straight bores, when indicated at each end and spun in a lathe the bore looks like a banana whipping around. A lapped barrel may not copper foul as much because the sharp edges in an unlapped barrel may strip copper from the bullets.
    If you want an accurate barrel you must keep the copper cleaned out of the bore.
    In over 15 years of looking through barrels I can say 1 thing, I have never seen a bad Krieger. Not saying some aren't drilled crooked it's just that they dont let them out of the plant that way. If they are crooked then they cut them off and offer them as a shorter blank.
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  10. #20
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    Quote Originally Posted by constructor View Post
    Gas port erosion is normal, they all have it.
    Chatter is caused partially by pulling the button through and partially from honing of the bore. Most all AR barrels have the chatter marks unless the bore is lapped like most match grade barrels.
    Believe it or not the chatter itself does not effect accuracy, I have seen barrels just like these that will shoot under 1/2" groups and some lapped match barrels that will not shoot under 3/4".
    There are other things that effect accuracy more than the finish in the barrel. A straight hole is one thing, a good crown, a chamber that is concentric and proper stress relief is more important than the finish.
    Just because the barrel is lapped doesn't mean it will shoot better. I have seen a ton of "match" barrels that don't have straight bores, when indicated at each end and spun in a lathe the bore looks like a banana whipping around. A lapped barrel may not copper foul as much because the sharp edges in an unlapped barrel may strip copper from the bullets.
    If you want an accurate barrel you must keep the copper cleaned out of the bore.
    In over 15 years of looking through barrels I can say 1 thing, I have never seen a bad Krieger. Not saying some aren't drilled crooked it's just that they dont let them out of the plant that way. If they are crooked then they cut them off and offer them as a shorter blank.
    Interesting. The only hammer forged barreled AR I have, is also by far the easiest to get the copper out of, if it collects any at all. This explains why.

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