Like the kind you'd find on those steel shelves in the garage. All told, I think the m-loc v keymod "war" is much ado about nothing.One's a bunch of slats, one's a bunch of keyholes. There are plenty of keymod accessories on the market and I don't think it's going Betamax anytime soon. With the amount of stuff I'm hanging from my handguards (minimal), I'll not be replacing one with the other. M-loc makes for a more streamlined look to a stock, but can be a pain to install.
Keymod is easier to use and I think a well designed accessory should not be an issue. If it used 2 slots the attachment would not be an issue. I don't think this is the fault of keymod per se, rather the use of a single slot is a poor design choice because the sling pressure is offset from the clamping force. Installing it correctly makes it more solid, but the screw on this one attachment seems to want to walk when I put a bunch of load on the sling. I was able to install it backwards and it pulled out under stress on the sling. I have a qd flush cup installed on my RPR that employs a single keymod slot. The one piece conical foot doesn't seem to deform the slot at all and holds torque a lot better. I've seen this style of foot on a light mount and foregrip, which in my experience works a lot better than the standard two piece screw and foot combination. 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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