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Thread: Barrel installation "botchery"?

  1. #21
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    Meanwhile, if it does happen to come down to replacing the upper, would this upper from BCM be a decent choice? While BCM is a trusted vendor, the name of the manufacturer of this upper is not mentioned for reputation checks. No offense to BCM here; please understand.[/QUOTE]

    I have used several of those uppers from BCM with no issues. Good quality for a build. Not sure, but I believe they are the same as used on BCM builds but are not marked with the BCM logo due to being sold as a part only and not a complete upper.

  2. #22
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    Whatever upper you get, you've got a couple of barrels to swap into the end of it and see how things fit.

    Some of those things I mentioned are from hanging with a bunch of bench rest shooters a long while ago. There is really no way to check some of that concentricity, say barrel to barrel-extension, without a very elaborate setup. I don't know what pains are taken in the manufacture of uppers to keep them straight and keep the ends square. Those facing cutters are made for us to use though.

    Here's what I'd do.... simple simple test.

    Take the fookin' muzzle device off! Then make some test firings. You'll know real quick whats up there. Just sayin!

  3. #23
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    Quote Originally Posted by KF5MLT View Post
    Much thanks for all the advice. cjb brings up a really good point about concentricity of barrel extension, upper receiver, and bolt even though everything may be tightened down and to proper numbers
    Unless its grossly out of spec this would not account for your issue.

    In any case, concentricity issues should have significant poi shift if it was bad enough to cause your problem.

    I would not do anything until you pulled the muzzle device (fh) properly and shot it. It also sounds like you used the same fh with the two barrels.

    Not saying its not the upper receiver, just that most concentricity issues which could be fixed by the Brownell tool are not as extreme as what you are seeing.

    But I'd sure shoot it w/o the fh before I did anything!




    Sent from my PRC-104 using phonetics

  4. #24
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    Quote Originally Posted by KF5MLT View Post
    Much thanks for all the advice. cjb brings up a really good point about concentricity of barrel extension, upper receiver, and bolt even though everything may be tightened down and to proper numbers and AKDoug correctly points out it is one of the last common parts... E-Man reminds me of the reputation the manufacturer of the current upper has...

    In the name of good troubleshooting, I'll definitely get it out without the muzzle device to see what happens. Meanwhile, if it does happen to come down to replacing the upper, would this upper from BCM be a decent choice? While BCM is a trusted vendor, the name of the manufacturer of this upper is not mentioned for reputation checks. No offense to BCM here; please understand.

    Thanks again.
    You really don't need to know who bcm gets there stuff from, as it's illrelivant. The fact is you are getting something from BCM, and thats all you need to worry about. ALL BCM stuff is g2g. If there is an issue with a part or product they sell they will take care of you as well.

    Now figured I'd mention my BCM blem upper was originally from Anchor Harvey, but even that doesn't matter. It's BCM and that is all that matters.

    FYI I'd just get a blem upper. Not sure if they are still on sale for 80$. You have to install the included forward assist and door however. Great savings for really no loss.
    Last edited by discreet; 01-19-14 at 13:15.
    From TOS ... "buy the shit out of that thing, all the mil spec is just nonsense."

  5. #25
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    Quote Originally Posted by discreet View Post
    FYI I'd just get a blem upper. Not sure if they are still on sale for 80$. You have to install the included forward assist and door however. Great savings for really no loss.
    No offense, but given his concerns the last thing I'd do is buy a blem upper. Not worth the $20 savings when you can get several top tier mfg uppers for $99-120 complete. (DD would prob be my pick, last one I bought was $107 shipped)


    Sent from my PRC-104 using phonetics

  6. #26
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    I have used many blem uppers for PSA. 40 bucks and every single one has never had an install issue.

  7. #27
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    Quote Originally Posted by pinzgauer View Post
    No offense, but given his concerns the last thing I'd do is buy a blem upper. Not worth the $20 savings when you can get several top tier mfg uppers for $99-120 complete. (DD would prob be my pick, last one I bought was $107 shipped)


    Sent from my PRC-104 using phonetics
    What are you talking about?

    First... BCM IS one of the TOP brands. Second, what does a blem upper have anything to do with his issues? Blem uppers from BCM are 100% in spec. The "blem" ordeal has 0 to do with anything functional or accuracy. There is nothing your DD upper would do that a blem BCM upper wouldn't do. I just mentioned Blem uppers were available and 40$ cheaper than non blem. Please do some research, especially on BCM blem uppers before you hint at the fact they are inferior, as well as hinting at the fact BCM is not 100% top notch from a quality and qc aspect.

    So much overthinking being done here. All this microscopic truing, syncing things up on a mollecular level etc. My god the bench shooter state of mind is mind boggling.
    Last edited by discreet; 01-19-14 at 14:26. Reason: grammar
    From TOS ... "buy the shit out of that thing, all the mil spec is just nonsense."

  8. #28
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    Quote Originally Posted by discreet View Post
    What are you talking about?

    First... BCM IS one of the TOP brands. Second, what does a blem upper have anything to do with his issues? Blem uppers from BCM are 100% in spec. The "blem" ordeal has 0 to do with anything functional or accuracy. There is nothing your DD upper would do that a blem BCM upper wouldn't do. I just mentioned Blem uppers were available and 40$ cheaper than non blem. Please do some research, especially on BCM blem uppers before you hint at the fact they are inferior, as well as hinting at the fact BCM is not 100% top notch from a quality and qc aspect.

    So much overthinking being done here. All this microscopic truing, syncing things up on a mollecular level etc. My god the bench shooter state of mind is mind boggling.
    What is your recommendation?

  9. #29
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    Quote Originally Posted by discreet View Post
    What are you talking about?

    First... BCM IS one of the TOP brands.
    I get it, you love BCM. I hope you got a hat.

    BCM makes fine stuff, no argument.

    You missed my point:

    1) he's chasing ghosts, and has already spent hundreds swapping stuff. Its false economy to save $20 on a blem upper at this point. I'm sure the BCM blem is just cosmetic and should be fine, but in this case its not worth saving $20.

    2) he has a DD barrel. With 1st quality DD uppers available $100-120 assembled, there would be some advantage in matching the barrel to the upper mfg if there's was an issue. ( not that I think his Upper is the problem)

    3) this is not a bench rest issue. Right now DD sub assemblies are a very good value. (Lpk, upper, bcg, etc)

    And I'd put their quality up against anyone's. Not saying they are better, just that they are tier 1 quality currently available at a very good price.


    Sent from my PRC-104 using phonetics

  10. #30
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    Actually, that del-ton (the first barrel) had a standard birdcage on it, which was sold with the barrel. The new DD barrel has a YHM 5C2.

    Evidence is in. I would be surprised if anybody found these groups acceptable from a bench, on bags, with magnification.

    Mixture of XM855 and XM193 with (denoted "w/MD") and without (denoted "wo/MD") flash hider. Looks like the next step is to replace the upper receiver.

    100_4060.jpg

    I know 10 shot groups are the standard for determining group sizes, but I would ask you: would you accept these groups with this ammunition out of your rifles while zeroing?

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