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Thread: BCM barrel length inconsistencies

  1. #91
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    Quote Originally Posted by BufordTJustice View Post
    The chart existed because companies started to do stupid things that decreased their cost (and decreased quality) to increase their profit margins...and then lie about it being a top-quality part. Like making a bolt out of 8620 steel instead of the much more expensive (and stronger) Carpenter 158. That affects function. So does the actual steel used for making the barrel.

    I'd take an "out of spec" BCM barrel every day of the week and twice on Sunday since I know it's made out of 11595-E mil spec barrel steel as opposed to....say any number of popular brands that are made out of some recipe of 4140. The exact barrel length doesn't matter to me nearly as much as the quality of the barrel.

    As Grant says, these are war horses, not show ponies (doesn't just apply to Colt). An additional .5" of barrel length does NOT impair function. I'm not the biggest fan of the chart.....but there is an apples-and-oranges bent to your comment.
    Oh come on, people make a huge deal out of the .040" difference between a F marked FSB and a regular one when 99.9% (guessing, but I'm probably close) of factory guns, abortion built mix and match guns, etc have never needed the additional travel to zero in.

    We hear the same crap with different sized buffer tube lengths too.

    As soon as one of the chosen one companies start doing something different it's acceptable though. Just like Colt with the purple finish (as you mentioned). Had Bushmaster (who used to be the chosen one) done that before Colt, we'd be bashing them for it saying it is a clear lack of quality control.

    This forum is better about it in some ways than the other one, don't get me wrong. But to pretend like there aren't some double standards... meh.

    I understand that BCM has built a name of quality. Mine is my go to bedside gun. There are few companies that I will buy parts from. BCM definitely should receive the benefit of the doubt as being acceptable and I fully understand the argument. I'm just saying

    I'm also curious as to what their process is for getting the barrels to size. I'm a machinist in training so when I see a .500 difference like that I assume someone didn't measure properly. I can't image their print has a +.500 -0 tolerance on length?

    Either way, if I order something a specific length that is precision machined, I hope it's coming closer to that size than .500". My bulk material that I order comes within a 1/4".

    I know, I know. "Who cares?"

  2. #92
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    dont buy a harddrive either and try to count the GBs

  3. #93
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    Quote Originally Posted by BSmith View Post
    Oh come on, people make a huge deal out of the .040" difference between a F marked FSB and a regular one when 99.9% (guessing, but I'm probably close) of factory guns, abortion built mix and match guns, etc have never needed the additional travel to zero in.

    We hear the same crap with different sized buffer tube lengths too.

    As soon as one of the chosen one companies start doing something different it's acceptable though. Just like Colt with the purple finish (as you mentioned). Had Bushmaster (who used to be the chosen one) done that before Colt, we'd be bashing them for it saying it is a clear lack of quality control.

    This forum is better about it in some ways than the other one, don't get me wrong. But to pretend like there aren't some double standards... meh.

    I understand that BCM has built a name of quality. Mine is my go to bedside gun. There are few companies that I will buy parts from. BCM definitely should receive the benefit of the doubt as being acceptable and I fully understand the argument. I'm just saying

    I'm also curious as to what their process is for getting the barrels to size. I'm a machinist in training so when I see a .500 difference like that I assume someone didn't measure properly. I can't image their print has a +.500 -0 tolerance on length?

    Either way, if I order something a specific length that is precision machined, I hope it's coming closer to that size than .500". My bulk material that I order comes within a 1/4".

    I know, I know. "Who cares?"

    You hit the nail on the head, saved me trouble of typing it up. Like you mentioned, seems like their is a double standard here.
    If the barrel advertised at 14.5 inches and when you get it it's 15, you start to question what else slipped by quality control. No seriously, this is unexceptable, especially for top manufacturer like BCM.

  4. #94
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    I would have preferred a 15” barrel instead of 14.5” so it could have had a 1” fh perm attached instead of a 1.5". Why not just keep it?

  5. #95
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    Quote Originally Posted by Pi3 View Post
    I would have preferred a 15” barrel instead of 14.5” so it could have had a 1” fh perm attached instead of a 1.5". Why not just keep it?
    This is the real reason I would care and BCM should keep it consistent.

    It only really matters for the 14.5", so you can pin the correct flash hider.
    If they are all 14.7-15" then you dont have to use an extended muzzle device.

  6. #96
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    Quote Originally Posted by grunz View Post
    This thread does have me asking two questions:

    1) What is the standard for measuring barrel length? Is to the back of the barrel extension, the begging of the rifling, or distance from inserted bolt face forward or something else? I just don't know.

    2) Why even offer 14.5 bbl ( i now its m4 lenghth) when we need a longer more expensive muzzle device to make it non NFA. I've seen some manufactures advertise 14.7 bbls tat just need a regular old A2 FH pinned on. Why isn't this the standard for civilian world, especially since we have mid length non standard gas systems too.
    1. Because alot of people have SBR's like myself and I like 14.5" barrels if I am going for a M4.

    2. because with a perma pinned flash hider you cannot install numerous free floated rails that use their own barrle nuts because the gas block will not fit over the flash hider.
    Quote Originally Posted by C4IGrant View Post
    Colt builds War Horses, not show ponies.
    Quote Originally Posted by Iraqgunz View Post
    This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?

  7. #97
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    Quote Originally Posted by BSmith View Post
    Oh come on, people make a huge deal out of the .040" difference between a F marked FSB and a regular one when 99.9% (guessing, but I'm probably close) of factory guns, abortion built mix and match guns, etc have never needed the additional travel to zero in.

    We hear the same crap with different sized buffer tube lengths too.

    As soon as one of the chosen one companies start doing something different it's acceptable though. Just like Colt with the purple finish (as you mentioned). Had Bushmaster (who used to be the chosen one) done that before Colt, we'd be bashing them for it saying it is a clear lack of quality control.

    This forum is better about it in some ways than the other one, don't get me wrong. But to pretend like there aren't some double standards... meh.

    I understand that BCM has built a name of quality. Mine is my go to bedside gun. There are few companies that I will buy parts from. BCM definitely should receive the benefit of the doubt as being acceptable and I fully understand the argument. I'm just saying

    I'm also curious as to what their process is for getting the barrels to size. I'm a machinist in training so when I see a .500 difference like that I assume someone didn't measure properly. I can't image their print has a +.500 -0 tolerance on length?

    Either way, if I order something a specific length that is precision machined, I hope it's coming closer to that size than .500". My bulk material that I order comes within a 1/4".

    I know, I know. "Who cares?"
    You are showing your ignorance with this post.

    The wrong FSB for a flat top upper can make it impossible to zero without the use of a longer front sight post.

    A buffer tube that is the incorrect size can cause issues, especially in a gas system as sensitive as a 14.5" midlength.

    The extra .5" does not impede function, nor will it place one in a legal situation when complying with NFA laws.

    Now, BCM has a reputation for quality, they also have a reputation for customer service.
    I know for fact they will gladly swap out the barrel no charge.

    This whole thread just seems like a "gotcha" thread.
    Quote Originally Posted by scottryan View Post
    Anybody that owns or sells pistol versions of assault rifles is a bottom feeder, irregardless of the ban status of certain ammunition.

    They are illigetimate weapons that have no real purpose other than to attract retards to the gun community.

  8. #98
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    You have no idea what you are talking.

    Quote Originally Posted by Toxa View Post
    You hit the nail on the head, saved me trouble of typing it up. Like you mentioned, seems like their is a double standard here.
    If the barrel advertised at 14.5 inches and when you get it it's 15, you start to question what else slipped by quality control. No seriously, this is unexceptable, especially for top manufacturer like BCM.



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  9. #99
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    Quote Originally Posted by BSmith View Post
    Oh come on, people make a huge deal out of the .040" difference between a F marked FSB and a regular one when 99.9% (guessing, but I'm probably close) of factory guns, abortion built mix and match guns, etc have never needed the additional travel to zero in.

    We hear the same crap
    with different sized buffer tube lengths too.

    As soon as one of the chosen one companies start doing something different it's acceptable though. Just like Colt with the purple finish (as you mentioned). Had Bushmaster (who used to be the chosen one) done that before Colt, we'd be bashing them for it saying it is a clear lack of quality control.

    This forum is better about it in some ways than the other one, don't get me wrong. But to pretend like there aren't some double standards... meh.

    I understand that BCM has built a name of quality. Mine is my go to bedside gun. There are few companies that I will buy parts from. BCM definitely should receive the benefit of the doubt as being acceptable and I fully understand the argument. I'm just saying

    I'm also curious as to what their process is for getting the barrels to size. I'm a machinist in training so when I see a .500 difference like that I assume someone didn't measure properly. I can't image their print has a +.500 -0 tolerance on length?

    Either way, if I order something a specific length that is precision machined, I hope it's coming closer to that size than .500". My bulk material that I order comes within a 1/4".

    I know, I know. "Who cares?"
    Poly already smoked you pretty good, but here's one more:

    For a guy who uses his AR IN REAL LIFE (i.e. on patrol), if you have a non-F-marked FSB and you properly zero your gun, the FSP stands proud of the protective ears and can easily get COMPLETELY DESTROYED if it accidentally gets brushed against a trunk opening, door jamb, or any other hard item located on or around one's patrol car.

    It's not "crap", guy. It ****ing matters. You'd be better-off dropping this as you seem more intent on attempting to bloody BCM's nose in the "brand wars" than you are about giving people sound, REAL WORLD advice.

    I'm just saying.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

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  10. #100
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    Has anybody found a barrel that is shorter than advertised, say 14 inches vs 14.5 - if there is variance this way it could cause legal problems.

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