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Thread: How could one identify what type of Aluminum a buffer tube is made from?

  1. #31
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    From an impact perspective, I would be far more worried about 6061 taking a lateral impact than I would 7075. A rear impact, as in mortaring out a stuck case, would be far less of a concern. I would be more worried about the stock giving out than the receiver extension.

    That said, I spend my money on 7075 tubes because it's cheap insurance.
    Last edited by _Stormin_; 11-25-13 at 00:02. Reason: spelling error

  2. #32
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    If you want to be real anal about it and had a harness tester.

    6061
    Hardness, Brinell 95 95 AA; Typical; 500 g load; 10 mm ball
    Hardness, Knoop 120 120 Converted from Brinell Hardness Value
    Hardness, Rockwell A 40 40 Converted from Brinell Hardness Value
    Hardness, Rockwell B 60 60 Converted from Brinell Hardness Value
    Hardness, Vickers 107 107 Converted from Brinell Hardness Value
    Ultimate Tensile Strength 310 MPa 45000 psi AA; Typical
    7075
    Hardness, Brinell 150 150 AA; Typical; 500 g load; 10 mm ball
    Hardness, Knoop 191 191 Converted from Brinell Hardness Value
    Hardness, Rockwell A 53.5 53.5 Converted from Brinell Hardness Value
    Hardness, Rockwell B 87 87 Converted from Brinell Hardness Value
    Hardness, Vickers 175 175 Converted from Brinell Hardness Value
    Ultimate Tensile Strength 572 MPa 83000 psi AA; Typical
    ^^ Read with southern accent !^^ and blame all grammatical errors on Alabama's public school system.
    Technique is nothing more than failed style. Cecil B DeMented
    "If you can't eat it or hump it, piss on it and walk away."-Dog
    Go where the food is.

  3. #33
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    Quote Originally Posted by Dead Man View Post
    As to 1, I'm intimately involved with standards and their employment, professionally. As to 2, I certainly have, and have seen others do it also- I've seen it break a stock, but never a receiver extension.
    I have seen the RE snap off and also bend.


    C4

  4. #34
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    I avoid PSA like the plague now because of how they pick and choose how they advertise their products. This is from a principal standpoint.

    From a practical/logical standpoint I avoid them because of the wide variety of parts/materials qualities...Not worth the gamble when their are more reputable dealers/vendors out there...

    I tried to like PSA..can't do it though...

  5. #35
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    There are commercial test kits using certain solutions that, when applied, will readily differentiate between 7075 and 6061 alloys (the T6 reference is to denote temper after heat treatment for either alloy and this can only be tested destructively)

    One would have to file off a bit of the anodize, say at the threaded end where it won't show, to use this method.

    Fortunately there's a test that is specific to these two alloys that can be done with household items. One gram of lye in 10 ml of water will make a (rather hazardous) solution, which will turn 7075 dark gray and won't affect 6061 much at all.

    Mind you this will also very effectively strip the anodize right off whatever it touches, so be sure to apply very sparingly only to the filed spot, with, say, a q-tip.

    Then rinse with water, without rubbing. The 7075 will be quite a bit darker, the 6061 won't be affected at all.
    Last edited by Archer1440; 11-27-13 at 09:06.

  6. #36
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    I knew there was going to be a sequel to Breaking Bad!!

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