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Thread: New BCM barrels

  1. #111
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    Quote Originally Posted by dmd08 View Post
    With the popularity of the elw profile will we see ELW SS barrels for light weight AND extreme accuracy?
    Going with a theme here today: I can't comment on future plans.

  2. #112
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    Phreakish,
    Please tell Paul and the rest of the gang that they are awesome and thanks for sharing with us.

    In your opinion is a low profile set screwed gas block more or less likely to come lose than a pinned gas block. The reason I ask is because it's my understanding the the new light weight barrells are not pinned and I am worried that the gas block will come lose with heavy use.

    Thanks again.

    As an aside are there any books you recomend reading IOT improve one's knowledge of the AR-15?

  3. #113
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    Quote Originally Posted by cd228 View Post
    Phreakish,
    Please tell Paul and the rest of the gang that they are awesome and thanks for sharing with us.

    In your opinion is a low profile set screwed gas block more or less likely to come lose than a pinned gas block. The reason I ask is because it's my understanding the the new light weight barrells are not pinned and I am worried that the gas block will come lose with heavy use.

    Thanks again.

    As an aside are there any books you recomend reading IOT improve one's knowledge of the AR-15?
    A pinned block is always less likely to come off. That said, I don't know of any returned uppers due to gas blocks coming off or moving. When properly dimpled and the set screw torqued with loctite and/or staked, it's pretty tough for it to come off. Our gas blocks are also made pretty tight which helps.

    As far as recommended reading: I've had the good fortune to be involved with some of the best in the industry for many years, not much reading involved. As an engineer, it's easy to see the hows and whys of the design. Combine that with some years in manufacturing and it makes a great deal of sense.

  4. #114
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    Thank You Sir.
    Given your responce I'll be waiting for the CHF ELWs with baited breath.
    Is there a recomended torque setting for the gas block for individuals who purchase the barrell, and gas block seperately ?
    Thank you again.

  5. #115
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    Quote Originally Posted by Phreakish View Post
    3) I've never used a reaction rod, personal preference. I've seen all manner of failures from installing a muzzle device onto an assembled upper. In almost every case the torque applied to the muzzle device was way beyond reasonable or the barrel nut was installed too loose. It doesn't take much to ensure a brake or comp is snug. If it won't align close enough for reasonable torque to clock it properly with the supplied crush washer, then either a new crush washer, flipping the washer over, or sanding/filing the thickness slightly (and evenly) are far better approaches than herfing it down with a breaker bar. In the shop, we'll go through a few crush washers until hand-tight aligns well enough for reasonable torque to clock the comp.
    This is really great advice right here that I wish more would read. You always see folks on YouTube really cranking down on A2 muzzle devices, when all you should need is a very slight turn after it gets hand tight.

  6. #116
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    Quote Originally Posted by cd228 View Post
    Thank You Sir.
    Given your responce I'll be waiting for the CHF ELWs with baited breath.
    Is there a recomended torque setting for the gas block for individuals who purchase the barrell, and gas block seperately ?
    Thank you again.
    For a #10 screw I'd start at around 30 in-lbs. When using an in-lbs torque wrench, it's deceptive. All the leverage makes it feel as if it's not tight when in fact it's significantly tighter than if you were to use an L shaped key. Small fasteners I've had the best luck just going by feel. Once it's bottomed out, it only takes another 1/8th turn or less to ensure it's not going anywhere. With loctite and a dimple, it takes even less since it's mechanically blocked.

  7. #117
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    Thank You yet again. Keep up the excellent work.

  8. #118
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    Quote Originally Posted by jerrysimons View Post
    Finally got a chance to weigh both a 14.5" Noveske Skinny barrel and a 14.5" BCM ELW-F barrel.
    These are the only two 14.5" continuous tapered, lightweight profile barrels I have found (maybe Sionics will join them?). That and the fact they are both made by tier 1 companies makes for an apt comparison. The Noveske is cold hammer forged "machine gun" spec steel w/ thicker chrome lining, and it has the handguard cap shoulder. Th details of BCMs awesome barrel can be found in this thread.


    14.5" Noveske Skinny barrel 20.85oz measured (stripped)
    14.5" BCM Standard ELW-Fluted 20.55oz measured (stripped)
    Some more info

    Gas Port diameters:
    BCM 14.5" Mid ELW-F, .078"
    Noveske 14.5" Mid Skinny, .088"

    Overall length:
    -Measured from the barrel shoulder
    BCM 14.5" Mid ELW-F, 14&1/16"
    Noveske 14.5" Mid Skinny, 14"

    -Measured from the barrel extenstion
    BCM 14.5" Mid ELW-F, 15"
    Noveske 14.5" Mid Skinny, 14&15/16"

    The BCM barrel is 1/16" longer than the Noveske.

    Profile diameters:
    Noveske 14.5" Mid Skinny
    - at barrel collar, .973"
    - about 1" ahead of barrel collar, .863"
    - about 6" bellow handguard cap shoulder .665"
    - about 3" bellow handguard cap shoulder, .625"
    - directly behind handguard cap shoulder, .608"
    - gas block, .625"
    - directly in front of gas block, .582"
    - directly behind muzzle device collar, .577"

    BCM 14.5" Mid ELW-F (not measured at the valley of the flutes)
    - at barrel collar, .977"
    - about 1" ahead of barrel collar, .780"
    - about 6" bellow gas block .690"
    - about 3" bellow gas block, .650"
    - directly behind gas block, .600"
    - gas block, .625"
    - directly in front of gas block, .575"
    - directly behind muzzle device collar, .575"

    The Noveske Skinny profile tappers faster than the BCM ELW and is actually thinner in diameter towards the base of the barrel. The ELW-F, however, is .3oz lighter due to the flutes (ELW-F is said to weigh .5oz less than the ELW on BCMs site, so the ELW is probably about .1oz or .2oz heavier than the Skinny). The ELW is thinner ahead of the gas block lending to the balance concept and use material where it is best served towards the chamber. While both barrels are tapered I would say the ELW is more linar in its taper over the whole length of the barrel. The Noveske tapers faster and is slightly thinner up to the gas block. For this reason I would venture a guess that the ELW profile is probably more ridged than the Skinny barrel and the ELW-Fluted is probably about same ridgity if just slightly more.

    I like how the BCM is already dimpled for a GB. The Noveske comes with a .625 gas block drilled for a pin and a pin, but if you want to use a different gas block you will either have to find one pre drilled for pinning, have one drilled for pinning, or have your barrel dimpled for a set screw in order to do it right.

    The steel BCM .625 GB is the same size as a .750 GB but just has a .625 diameter hole.
    The steel Noveske .625 GB is scaled down for the smaller diameter.






  9. #119
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    Quote Originally Posted by jerrysimons View Post
    I like how the BCM is already dimpled for a GB.
    Yes, this is very nice and I wish more companies would do it.

    The Noveske comes with a .625 gas block drilled for a pin and a pin
    For the price of their barrels, I'm glad they include a pinned gas block.

  10. #120
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    Great post bud. I've been waiting for someone to post something this detailed just on the ELW alone. Nice to see a side by side comparison with another barrel.
    On a side note: I'm amazed by how large the Noveske's port is.

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