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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
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) ?
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Last edited by danpass; 07-24-13 at 10:26.
Dan Miami, FL
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.
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.
Last edited by Phreakish; 07-24-13 at 11:59.
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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