I've noticed that some BCM accessories use a one piece, conical keymod screw that I would liken to the AI keyslot feet. To BCM's credit they took care of the issue and sent me two aluminum KMR's with additional store credit that I put towards aluminum keymod rail sections that have been working out just fine since. The two pull through failures that I had involved a bad BCM polymer rail where the foot was able to rotate backwards inside the slot while being tightened, which would open up the slot and allow the foot to be pulled through. This was unslightly and disappointing but beyond that it appeared to still function ok.
The failures involved a polymer BCM keymod rail and at first I noticed that when the rail was tightened down, the keymod foot would have an almost shearing effect to the keymod slot and deform the surface of the rail.
That being said, these failures were on the original KMR rails made from magnesium alloy that were known to be softer than regular aluminum.
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