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Thread: New BCM rail

  1. #251
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    Quote Originally Posted by Koshinn View Post
    I have to ask... Is that a Kevlar dress?

    Looks like something a turret gunner might wear...? Or a modern Roman Legionary?
    I was at the HSP class where those pics were taken.

    That is one of my friends AJ, who was in a former MARSOC unit. He was one of the assistant instructors for Travis and he helped put the class together locally. He works for Engage Armament here in Maryland (Great Company -Class II manufacturer and Class III dealer) and they also run their own training classes. He is a great guy and he and the guys at Engage were some of the ones who helped lead the charge in opposition to all the commie gun legislation that got got ram rodded through the state this year.

    In the picture he was wearing some Afghan man jammies (common shirt the locals wear over there), very good in the heat but not so so much when your all kitted up over it. They were doing some shooting and he ended up throwing on his plate carrier over it when these pics were taken.


    Quote Originally Posted by JoshuaJJackson View Post
    So your saying the new BCM rail would definetly be worth it no matter the price comsidering a larue 13.2" rail is 17.8oz and the BCM 13" has been mentioned here to possibly be 7.7oz? That's way over your arbitrary 6-8oz reduction.
    Travis mentioned the weight but I am not allowed to say it as BCM has not released it. I know that is not helpful but it is light!

    I had been planning on getting a Centurion Arms CMR or another Noveske NSR rail but I will wait and get one of these now.

    Quote Originally Posted by sinlessorrow View Post
    I really like the rail and everything BCM makes is gold. That optic though.....worste $850 I ever spent.
    Quote Originally Posted by Freedoooom View Post
    Has reflection problems, whether it be seeing your own face or seeing 2 dots.
    The SRS that Travis has in that picture is the new Gen II SRS that has the newer yellow lens coating that gets rid of all those issues with the internal reflection and that issue with the seeing the diode emitter when looking through the optic.
    Last edited by TACAV; 08-25-13 at 14:47.

  2. #252
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    Tac,

    The inside info is appreciated. Interesting updates about the SRS though. Personally a T-1 does everything I need and exceptionally well but I always had a keen interest in the SRS. The fact that a revised version is coming (or already out there?) may warrant another look.
    “Answer The Bell...” J.W.

  3. #253
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    Quote Originally Posted by jpmuscle View Post
    Tac,

    The inside info is appreciated. Interesting updates about the SRS though. Personally a T-1 does everything I need and exceptionally well but I always had a keen interest in the SRS. The fact that a revised version is coming (or already out there?) may warrant another look.
    Unless the solar cell runs the optic without a battery your better off with an Aimpoint.
    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?

  4. #254
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    Quote Originally Posted by sinlessorrow View Post
    Just a missed opportunity with some bad fleas.


    You got something to say?
    A question about the optic as I was interested in purchasing one. I didn't want to jack the thread so I edited (Last edited by signkutter; Today at 12:15 Reason: off topic) but couldnt delete the post, hence the "..........".. Anyway you answered all my questions in your responses pertaining to the Optic. Thanks for the information.
    Last edited by signkutter; 08-25-13 at 17:49.

  5. #255
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    Quote Originally Posted by thopkins22 View Post
    Magnesium is very, very light.

    Pure aluminum weighs 2712 kg per cubic meter.
    6061 aluminum weighs 2720 kg per cubic meter.
    7075 aluminum weighs 2800 kg per cubic meter.
    Pure magnesium weighs 1738 kg per cubic meter.

    Magnesium is roughly thirty six percent lighter by volume than aluminum. 473 degrees celsius to ignite Mg ribbon...much higher for larger samples. In fact it has been used in high performance engines for a long time.

    I'm not really on the keymod bandwagon, but Mg alloys are a damn good choice for rails.
    I feel exactly the same way. I am not going to replace my MI 9 ounce 13 inch rail with the new Keymod systems available or soon to be available. But I think that they will be light and they will be at least as durable as anything out now. Hopefully the Keymod rails wont be the only rails made of magnesium alloy. I would love to see the MI SS gen2 made of magnesium alloy.


    Just a note, it's not "reportedly." The science is there, hammer forged barrels are in fact more durable. It's not up for debate...forging has been proven to provide the benefits claimed. The fact that the barrels are produced faster, more consistently, and more inexpensively(if you don't count the cost of the forge,) are icing on the cake. What can be debated is whether or not it matters to 99% of shooters...of course it probably does not.
    You will get no argument from me. I say "Reportedly" because aside from barrel finish I cant tell the difference. That doesnt mean I discount what has been stated by experts and manufacturers about the characteristics of a CHF barrel. If I have the opportunity to purchase a CHF barrel for a reasonable price I would rather have one than not.

    In short I dont feel that I will ever see the advantage that a CHF barrel provides over a quality honed button rifled barrel ( I just don't shoot enough ) but I dont question the advantages exist. I also don't think that people that insist on buying only CHF barrels are idiots, as so eloquently stated by Turretgunner. Some people want the very best and are willing to pay for it. No harm , no foul.
    Last edited by signkutter; 08-25-13 at 18:07.

  6. #256
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    Quote Originally Posted by signkutter View Post
    A question about the optic as I was interested in purchasing one. I didn't want to jack the thread so I edited (Last edited by signkutter; Today at 12:15 Reason: off topic) but couldnt delete the post, hence the "..........".. Anyway you answered all my questions in your responses pertaining to the Optic. Thanks for the information.
    Roger that, did not see the Edit part.
    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. #257
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    Quote Originally Posted by thopkins22 View Post
    Magnesium is very, very light.

    Pure aluminum weighs 2712 kg per cubic meter.
    6061 aluminum weighs 2720 kg per cubic meter.
    7075 aluminum weighs 2800 kg per cubic meter.
    Pure magnesium weighs 1738 kg per cubic meter.

    Magnesium is roughly thirty six percent lighter by volume than aluminum. 473 degrees celsius to ignite Mg ribbon...much higher for larger samples. In fact it has been used in high performance engines for a long time.

    I'm not really on the keymod bandwagon, but Mg alloys are a damn good choice for rails.



    Just a note, it's not "reportedly." The science is there, hammer forged barrels are in fact more durable. It's not up for debate...forging has been proven to provide the benefits claimed. The fact that the barrels are produced faster, more consistently, and more inexpensively(if you don't count the cost of the forge,) are icing on the cake. What can be debated is whether or not it matters to 99% of shooters...of course it probably does not.
    Except its an ALLOY, not pure mag.

    And comparing it to a 10 year old Larue design, is just disingenuous.
    When will your rail be getting anywhere close to melting point? When will it take the abuses to warrant a different material. Weight savings is the only real benefit, but there are other designs that have similar weight, like http://fortismfg.com/index.php?route...&product_id=63. Yet somehow they are able to put out a very competitive price. Lets see if BCM want's to be competitive or price it like it's made of gold.

    Also what Barrel nut and what is it's weight (sorry if already stated)

    Please explain the science behind why CHF barrels are more "durable". Plenty of US companies use CHF, and they produce shitty barrels. The type of process does not matter near as much as the experince, tooling, and materials used to make them.

    If anything, CUT barrels tend to lead the way in accuracy. Chrome the shit out of just about any and you are going to have the same/similar wear properties. Once the chrome is wore through, CHF/Cut/Button, none of that shit will matter.
    Last edited by TurretGunner; 08-25-13 at 18:37.

  8. #258
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    Quote Originally Posted by sinlessorrow View Post
    Just a missed opportunity with some bad fleas.

    First is the price. Its $450 more than a PRO but offers the same battery life and a .25moa smaller dot.

    The solar panel does not power the optic if the battery is dead, it only works if the battery dies while in the sun. This was a huge missed opportunity and really came out with me questioning why is it even there if it only works when you have a good battery.

    There is a horrible reflection from the diode set in the optic that completely blocks your target and minimizes the dot enough that you cannot see it.

    Its heavier than other optics.

    The only pros imo was the large FOV and the Bobro mount.
    You forgot the "wonderful" ergonomics of the increase / decrease buttons being on opposite sides of the optic.

    Friend had one, sold it, bought another, sold it as well.

    Complete pass IME.

  9. #259
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    Quote Originally Posted by RHINOWSO View Post
    You forgot the "wonderful" ergonomics of the increase / decrease buttons being on opposite sides of the optic.

    Friend had one, sold it, bought another, sold it as well.

    Complete pass IME.
    Yep that was another bad point of it, and they were ridiculously stiff, like so stiff they were a pain to increase on the fly if needed. IMO the idea was there for the optic but its just like with trijicons Tri Power, awesome idea horrible execution.
    Last edited by sinlessorrow; 08-25-13 at 18:49.
    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?

  10. #260
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    Quote Originally Posted by Phreakish View Post
    That's 7.7 oz for the BCM-KMR-13 rail, which is the complete weight (with all mounting items, including barrel nut).

    The bare BCM-KMR-13 weighs 5.5oz and is long enough to cover the gas block of a rifle length gas tube (approximately 13").

    The bare BCM-KM-10 (10" variant which will cover the gas block of a mid-length gas tube) weighs approximately 4.3oz for a total assembly weight of 6.5oz.

    These are the only details we'll be releasing at this time.
    This rail beats the NSR by a sizable margin considering how light the NSR already is. The 10" BCM-KM assembly is 2.75oz lighter than what a 10" NSR rail assembly would weigh; 6.15oz for the NSR rail and 3.1oz barrel nut and hardware for a total of 9.25oz vs. only 6.5oz.
    The 13.5" NSR assembly is 11oz while the 13" BCM-KM is only 7.7oz! Heck the 11" NSR assembly is 9.8oz. The 13" BCM-KM is 2" longer and over 2oz lighter! This is a remarkable gain (loss?).
    Last edited by jerrysimons; 09-18-13 at 16:44.

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