LOL---
I saw your post and the link back to the Lead Sled. Funny thing is I compete IBS 1K BR and have never seen one and never have even heard of one being mentioned or shown on a single persons equipment list nation wide ever.
If it works for your program then that is what is important.. Hell none of my rifles have the sling swivels installed unless I am in the mountians lol because they hang up on the bags. My good wood rifles all use flush detachable swivels.
I wish I can afford the ones you guys use in the BR circuit.