I did get a lot of off forum push back. You should read my email. That was the biggest part of my hesitance to post. It did serve a purpose though in that it forced me to try and retry certain things multiple times. The down side is that some of my friends in the industry have now put me on ignore.



With QD swivels most use the hole in the keymod to allow the stud on the swivel to pass through. This keeps the mount low profile. On one mount, when I tighten the screws the mount would actually move far enough that the stud would not seat. I had to loosen the screws, insert the swivel, then tighten the screw again. On a couple of occasions the mount would move with the stud in place. This traps the stud and the friction would not allow it to rotate. The swivel was then stuck and you could not remove it. I had to loosen the screws to remove the swivel. As the screws were tightened we could see the mount move aft on the rail.



The BCM sling mount has a lip on the front that grabs the next hole forward. This keeps the swivel from working its way aft. You will now see two of the BCM mounts on this gun. One on each side. These seem to solve this issue for me.



I did have an occasion or two when I would do a transition and drop the gun on the sling. The weight of the gun falling on the sling pulled the mount loose and to the rear. Again the stud was trapped. Using loctite and did not help. Again, not a BCM mount. If the hole and slot were reversed, then the mount would be pulled into the hole and not out of it. That would at least make the sling issue a non issue. Slings don't usually get pulled forward. Apparently the engineering shows that under recoil things move forward not aft, and that's why they made it this way.



I use the IWC 2to1 triglide. I run my sling in two point and will transition to one point. I can't do that if its trapped. Also my work partner is right handed but shoots off her left shoulder. With QD's I can hand her the gun and she can swap the sling to the other side for her. That's the beauty of the QD setup sling, the QD lower receiver end plate, and QD's on both sides. Which is how this gun is set up. The sling can go from one side to the other very quickly. EAG sets up their guns the same way so that lefty students can run the same guns.



I could use some other sling attachment system, but the QD works so well I don't care to change. And its not the mount to sling interface that is the problem, its the mount to rail interface.



Don't misunderstand. I like the size, shape, and weight of the keymod tube. For most non working applications its fine. But I just can't trust it on a duty gun. Again, YMMV, and its just my opinion. Unfortunately, its one that I voiced in public, and it has cost me a great deal. People I respect took it personally, and for that I am truly sorry.



The IWC / HSP light mounts have not been an issue. But they never get jerked around. If they take a hit from front to rear, who knows. I have not had that happen yet. There's not enough weight on them to force them to move.



So far the KAG has not moved, but I have not really run it hard yet. I may swap back to the new VFG since my partner has small hands it that seems to work better for her. All my working guns are set up to allow it to be used by my partner if need be. So I have very specific needs.



All that being said, this gun is a shooter. And it handles like a dream. Its fun to shoot and like all things BCM very reliable. Now if only Sherman and Peabody would let me borrow the way back machine.

When I tighten the screw, the screw of course goes clockwise. As it tightens, the motion of the screw moves the mount to the rear. I have tried loctite and it does not fix the movement. It does keep the screw and fastener from getting loose, but the trick is to get it to stay in place at the front of the slot, not move aft into the hole. Its hard to describe. But you need it to stay in place, before you apply the loctite.



The accessory is smooth metal and the rail is smooth metal. You can only get so much friction that way. On a picatinny rail you have solid metal structures to hold the accessory so it won't move fore and aft. They already don't move up and down. My guess would be you need less tightness, and or friction, on a picatinny rail since you have solid metal to push or pull against.



Anyway, the BCM mount has a tab that goes up and over the front of the slot and drops into the next hole on the rail. When you tighten the screws the tab holds on to that edge and prevents rearward movement. If other widgets were to do this, it would probably solve the problem. Or most of it.



You can mount a lot of stuff on the top picatinny rail, but if you don't or can't use the keymod slots, what's the point.



Coincidentally, Impact Weapons Components is releasing a new weapon light for keymod. Elzetta built the light and IWC built the mount. In this case the mount goes in the slots and pulls aft into the hole. Draw your own conclusions there.



First one in the wild on my MI rifle. You can see the open slots forward of the mount.







 

Lets be clear. Nobody at BCM or IWC said a word to me. They continue to have my loyalty and support. Do not assume or infer anything bad about either company.



Others not so much.