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Wouldn't the extra step of a picatanny rail add to the weight and increased chances of failure....
Nate
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No, not with in-spec stuff (like mentioned, the stuff from BCM). I did have a scout mount come loose when shooting once,
but that was my fault. I was checking the placement of the light so it was not setup properly with loctite and the recoil screw. Now it sits in its permanent spot torqued to spec and has loctite and have not had issues.
Just like mlok, keymod uses a system of holes to mount in such a way that you create forward and rearward pressure when installed correctly. On the light mount I mentioned it is another screw, but on the sling mount for my rail it has a lug machined into the aluminum of the sling mount to prevent rearward travel. If not done properly either system (keymod or mlok) WILL fail under use. The poly rail sections are not recommended on load bearing items, use aluminum on those.
My upper (all BCM, Surefire, Aimpoint, and Magpul):
BCM's rail panels for keymod are made specifically to work on the KMR/KMR-A rails to give a more rounded feeling, but will work on other rail systems (and vise-versa). Also my foregrip in that picture is a direct mount and is really sweet, perfect length and angled rear for a "c-clamp" type grip. Then you see the Surefire M300 directly mounted on a BCM offset mount. Those are the only keymod items I have used/plan to use.