I've never seen one in use, but I'm intrigued by these single point sling mounts that mount to pic rails. I'm not sure how I feel about the idea, but it seems like it could be a viable option, and would let a guy hang his rifle from a more forward position (compared to an endplate adapter mount). Moving my mount point forward a bit on one of my longer/heavier coyote rigs might help make it balance better for carry, but I'm not sure how I feel about having the sling mounted beneath my scope (naturally on the receiver rail, while my scope is on risers and rings).