I first started with the gun bearer and while it worked ok I didn’t like the rifle/barrel position while hiking. I then switched to the all nylon slik sling and liked it a lot more but still felt it could be better.
I then switched to the exo rifle carrier and slik sling combo. Exo bottom and slik sling top strap. I have come to like this combo the best. Having the weight of the rifle supported by the whole suspension system of the pack is much more comfortable than having it supported by a strap in one small section of the waist belt. It seemed to always create a pressure point on my hip during extended hikes no matter where I positioned it, that is no longer a problem with current combo. Retrieval is almost as quick as the standard slik sling in my experience.