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Thread: BCM barrel length inconsistencies

  1. #21
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    Got a response from BCM.

    They didn't answer my question and simply responded with:

    "Hi Dave,

    Thank you for contacting us. We do appreciate your business. If you are not completely satisfied with your purchase you are welcome to return the stripped barrel to us for a refund. If you would like to return the barrel, please let us know and we will issue a RMA to return the barrel.

    Thank you for choosing BCM."



    For those of you asking... I'm 100% sure its a 15" barrel. I measured it 10 times now. I have a 24" Dewey 1 piece cleaning rod which I drop down the barrel onto a closed bolt, I then mark the cleaning rod at the crown and pull it out and measure the rod. My 14.5" barrels will measure 14.5" at the crown, this BCM barrel definitely measures 15" at the crown.

    Also for the person talking about 2/10" (why not simply it and write 1/5")... last I checked the difference between 14.5" and 15" is 1/2".

  2. #22
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    Seems this got moved to AR Tech.

    I'd still like to hear some insight from anyone that has experience in the barrel making industry if its standard to have such a big difference in barrel lengths. I can understand .1" or so, but .5" just seems a bit extreme to be considered acceptable.

  3. #23
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    BCM barrel length inconsistencies

    Quote Originally Posted by sugerwater View Post
    wow such a deep topic. ever here of tolerance, as in manufacturing? send bcm a few bucks for the extra length and call it ok.
    If you ever "here" of a manufacturer who has a half-inch tolerance range on a 14.5 inch long part, I'd advise you to walk the other way.

    Gas ports and buffer selections depend on certain assumptions about barrel length. BCM will surely swap this out, and needs to know about the disparity.
    This isn't an illegal gun, it's an "undocumented protection device". Don't be so insensitive.

  4. #24
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    BCM barrel length inconsistencies

    Quote Originally Posted by BufordTJustice View Post
    +1

    I love the Oxford Comma!!!!

    Yeah, for a guy (me) who prefers longer-than-A2 muzzle devices (SF MB and PWS FSC556), the difference between a 14.5" and a 14.7" is not worth worrying about. My wife's PSA CHF 14.7" FN-marked barrel (w/ perm'd A2) handles just about EXACTLY the same as my BCM 14.5" w/ perm'd FSC556.

    I've never had my muzzle get hung up on something (car door, web gear, duty belt, door frame, tree branch, etc.) and said, "MOTHER****ER! That last .2" just ****ED ME HARD!!! I WISH I HAD A REAL 14.5" BARREL!!!"

    In all seriousness, what happened if Colt's 16" barrels were actually 16.1"? Or if 20" barrels measured 20.2" (I've seen this multiple times on Colt 20" rifles)? Or if an 11.5" Noveske barrel was ACTUALLY 11.6"? *GASP*

    If exact barrel length bothers somebody, they shouldn't even waste their time measuring custom barrels from Bartlein and others. They cut each crown until it is perfect...this means that NO BARREL is exactly the same length......there will be variations. *SECOND GASP*

    This is normal, folks. There is some variation in machining processes. Don't lose your minds over it. Really.

    AND, in terms of tactics (i.e. in the REAL WORLD), .2" doesn't matter for JACK SHIT. Period.
    Work on your reading comprehension. It's a half-inch off, not a tenth or two-tenths off.

    If you'd read half as much as you've posted here on M4C, you'd know that everything from gas port size and buffer selection to calculating ballistics and zeroing a rifle includes assumptions about a barrel's actual length.

    Congratulations on this not mattering to you. It apparently matters to the OP. I'm sure you enjoyed your little spiel above, but some people here would like to have a useful conversation free of folks who prefer to ridicule someone's discovery instead of contributing something useful.
    Last edited by Traveshamockery; 04-28-13 at 18:25.
    This isn't an illegal gun, it's an "undocumented protection device". Don't be so insensitive.

  5. #25
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    Quote Originally Posted by Hwikek View Post
    Why do we need two threads on this non issue?
    Maybe because it's become an issue for some and they are asking for clarification regarding a legitimate discrepancy.

  6. #26
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    Not that it matters, but all my 16" BCM barrels (three) measure 16.5" My DD and PSA measure 16.2" Fastest chronographed one of the bunch, the DD. While I understand what Trave is trying to say, I doubt very much .5" is going to effect anything in calculating ballistics for a 14.5 or 15" fighting carbine.
    Last edited by AKDoug; 04-28-13 at 18:38.

  7. #27
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    Quote Originally Posted by AKDoug View Post
    Not that it matters, but all my 16" BCM barrels (three) measure 16.5" My DD and PSA measure 16.2" Fastest chronographed one of the bunch, the DD. While I understand what Trave is trying to say, I doubt very much .5" is going to effect anything in calculating ballistics for a 14.5 or 15" fighting carbine.
    It wouldn't matter much to me in my applications. I was just trying to illustrate why someone might have a very quantifiable reason to care.

    I'd find BCM's ultimate response interesting, though we might not get one. I think the posts about barrel crowning make the most sense - I suspect barrels are cut long to allow for re-crowning if necessary, though 0.5 inches seems excessive...

    14.5-inch mid-lengths have been known to be a little temperamental with certain barrel/ammo combinations, so even marginal changes to barrel length could have material effects on the function of a mid-length system.
    Last edited by Traveshamockery; 04-28-13 at 18:51.
    This isn't an illegal gun, it's an "undocumented protection device". Don't be so insensitive.

  8. #28
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    Unless I missed it what appears to be lacking after numerous inquiries regarding inconsistent length is simple communication. Machining, specifically cutting a such a product to size is not percieved to be complicated. Therefore a better understanding of the origin of such discrepancies shouldn't be too much to ask for in this case.

    I've bought from Paul with full confidence too and plan to do so again, but maybe this one topic should finally be addressed even if to a menial extent.

  9. #29
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    I imagine that there is someone in customer service who know's nothing about how the barrels are built hitting an automatic reply button. While that's not what we've come to expect from BCM, it certainly is understandable under the current market. Actual talented AR15 knowledgeable people are spread thin at this point.

    The middy's seem to run better at 16", so being a 1/2" longer might make it run better

  10. #30
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    Someone please explain rationally and coherently why this issue is a big deal? If the barrels were undersized I get that because you could be in violation of state and federal law.

    That isn't the case here so I have to ask why is it a big deal? Those of us who have BCM barrel and uppers can testify to the fact that they are some of the best available on the market.



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