Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I don't know why I didn't think or it before, but you might try something like this.
Galati International: AR-15 Front Sight Sling Mount - Yankee Hill
Did you look at the link OP posted? it does not have front sight.
I have tried several mounts on the flattop and am now happy with this rig as no mount required.
It installs in a minute and stays in place.
Tactical 3-Point Sling for AR15/M4 Carbine Rifles @ Buffertech