Curious to see what you figured out.
For any real duration such as hiking and hunting, I have my doubts about how well a single point of support on the rifle will be comfortable. The rifle needs to be constrained from moving in any axis. Maybe you figured out how to do this.
The gunbearer is made by Kifaru. It supports the rifle from the bottom and is clipped in around the barrel, providing two points of security so the rifle doesn't move around. It's also very easy to remove the rifle in a timely manner if needed.
The kifaru and SG work the same way, the Kafaru is easier to take on an off because the securing strap is on the shoulder strap. But Still to permanent for my liking. I find if its not stupid simple and fast to put it back on I won't do it and just hold the rifle but everyone has their own preferences. As far as the single point of support, it feels just like using a gun sling in some since I usually always have my arm resting against it or my hand on the grip. However if I do want it to be more secure I could use my old SG Sling bottom harness, or even just wrap it once around the grip and it also doesn't move. One other reason I didn't like strapping the rifle to the side of the back is if I wanted to sit down and glass etc, I couldn't sit down or take my pack off without the butt of the rifle hitting the ground and making a weird situation. So I would have to go through the whole process of taking it off and on etc. That was my personal gripes, some may not have those gripes.
With the link system the way I have it set up. (MIND YOU I JUST GOT IT, and I am still playing around with it)
I envisioned it as an easy way to carry between stages. Never considered for hunting and stuff. Would like to see what you did.
I have the link clamped onto Some of the excess strap from the upper position of my pack, and it loops around. Also in the clamp is some webbing which I run through one of my shoulder strap loops. So When I was to holster the rifle, I pull the strap down which brings the Link right to my shoulder, I put the rifle in, and let it hang on the side of my pack. When I am ready to take my off I do the same thing and pull the strap and pop it off. I am using the strap on my shoulder strap so I don't have to try and reach around my back etc. Just makes things easier.
I am also playing around with an elastic strap on the bottom of the webbing which you can see in the pictures (Brown) Its a work in progress, but so far I LOVE IT. See photos below.
Mounted on the side of the rifle ( I do have the attachment piece further down my rail now so the barrel sits up higher)
Arm under the rifle, and pull the strap
Then you just pop it right off.
To put it back on, same thing. pull the strap which brings the link to your shoulder strap. and slide it on.
Again this is more to replace a tradition sling, and for me I am always Slinging and unsling my rifle. This also has some more permanent ways to mount it if you want to as well.
oldballsinc.com 
