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Thread: New BCM rail

  1. #61
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    Quote Originally Posted by ScatmanCrothers View Post
    Who is a representative of his company and products. The most legit and well informed rep of the company actually.
    Yes, but when used in its traditional "Rep" manner, it implies that they do not know what they are talking about.


    C4

  2. #62
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    Quote Originally Posted by C4IGrant View Post
    Yes, but when used in its traditional "Rep" manner, it implies that they do not know what they are talking about.
    Then I should be a Keymod REP!
    "You people have too much time on your hands." - scottryan

  3. #63
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    I would think that since Eric Kincel now works for BCM , and Kincel developed the keymod, that maybe the historical info put out by BCM would be accurate

    But that's just me

  4. #64
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    Quote Originally Posted by ESK View Post
    Don't forget about Counter-Recoil, which is actually worse, when it comes to a sharp impulse. Courter-Recoil breaks optics, not recoil. Also, the KeyMod interface and related accessories utilizes "both ends" of the slot to secure properly, combating either direction of recoil.
    I'm not seeing how that is possible (based on the spec). You have a larger diameter (a keyhole), a chamfered nut fits within/thru that keyhole, slides forward into the keyway then gets tightened up. The chamfer of the stud locks onto the backside chamfer of the keyway (vs the keyhole) by way of tension.

    I must be missing something, perhaps something on the accessory side.


    Edit: I'm guessing Detail B is a requirement on all keymod accessories themselves (for the system to work fully) ?

    Last edited by danpass; 07-24-13 at 10:26.
    Dan Miami, FL

  5. #65
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    Re: New BCM rail

    Quote Originally Posted by Larry Vickers View Post
    I would think that since Eric Kincel now works for BCM , and Kincel developed the keymod, that maybe the historical info put out by BCM would be accurate

    But that's just me
    You would think so, right?

  6. #66
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    Guys I say lets just wait for the rail to be released. If the rail is priced over $200 who cares we all the know and trust the BCM quality. We know that Paul is not going to put out a poor product.

  7. #67
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    Quote Originally Posted by danpass View Post
    I'm not seeing how that is possible (based on the spec). You have a larger diameter (a keyhole), a chamfered nut fits within/thru that keyhole, slides forward into the keyway then gets tightened up. The chamfer of the stud locks onto the backside chamfer of the keyway (vs the keyhole) by way of tension.

    I must be missing something, perhaps something on the accessory side.


    Edit: I'm guessing Detail B is a requirement on all keymod accessories themselves (for the system to work fully) ?

    Honestly just looking at the plans, I didn't get it at first either. I'll take pictures at lunch and post them in an hour or two, check back then.
    "I never learned from a man who agreed with me." Robert A. Heinlein

  8. #68
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    Correct, detail B shows the counter-recoil lug.

    The chamfered nut in the chamfered slot gives a significant purchase to screw-attached items. The nut also acts as a recoil lug. When fired, the weapon moves to the 'rear', heavy accessories don't want to move to the rear, and thus are being shoved 'forward' on the rail. However, recoil forces build-up in relation to the acceleration of the projectile and aren't very 'sharp' impulses. They have a curve to them.

    The larger thru-hole portion of the keymod acts as a passage for installation of the nut, but also acts as a counter-recoil feature. When the BCG slams shut, there is a sharp impulse wanting to drive the gun forward, and accessories 'to the rear'. Those accessories are typically also already moving rearward due to recoil - thus counter-recoil is both a greater force and a sharper one as well (as Mr. Kincel pointed out, it's counter recoil that kills optics).

    The thru-hole portion is also conveniently sized to clear the nose of a QD sling swivel (actual required size would have only been ~.315"), but is not intended to be used as a socket. This is because the diameter is interrupted by the slot feature.

    Quote Originally Posted by danpass View Post
    I'm not seeing how that is possible (based on the spec). You have a larger diameter (a keyhole), a chamfered nut fits within/thru that keyhole, slides forward into the keyway then gets tightened up. The chamfer of the stud locks onto the backside chamfer of the keyway (vs the keyhole) by way of tension.

    I must be missing something, perhaps something on the accessory side.


    Edit: I'm guessing Detail B is a requirement on all keymod accessories themselves (for the system to work fully) ?
    Last edited by Phreakish; 07-24-13 at 11:59.

  9. #69
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    Quote Originally Posted by colthpd15 View Post
    Guys I say lets just wait for the rail to be released. If the rail is priced over $200 who cares we all the know and trust the BCM quality. We know that Paul is not going to put out a poor product.
    It is nearly impossible to have a rail made out of a Magnesium Alloy, that is lighter than the competition, has Distr/Dealer pricing levels and retail at $200 or below. So people can forget about that fantasyland!




    C4

  10. #70
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    Nevermind, looks like it was pretty well explained here.
    "I never learned from a man who agreed with me." Robert A. Heinlein

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