Simple single point sling solution with setina rifle racks. YMMV if using a different lock.
Loop the sling with a bight along the rail/ hand guard. (Should come up from the rear attachment towards the muzzle and then flip back down). Secure the whole sling and hand guard in the handcuff style lock.
To deploy, unlock the rack, grab the hand guard and sling together, and remove the rifle. Immediately don and charge. No snags. Completely free.