I have an Eberlestock F1 mainframe with vapor 2500 and rifle scabbard. I really like the layout, but when I put more than 70 lbs on it the belt it has a tendency to slip on me quite a bit. It's not the worst thing in the world, but it can get pretty uncomfortable on the shoulders, even with the upgraded belt they offer. But for my style/area of hunting (chaparral, steep hills using trekking poles) not having to deal with my rifle slipping all over the place is integral to my mental health. I've thought about other methods of rifle carry, like the kifaru gunbearer or the other kinds that are strapped to your belt and shoulder strap, but it's seems overly complicated compared to a scabbard.... perhaps I'm just ignorant. I wish the kifaru stryker xl had the capability to put a scabbard on it... that would be my ideal set up.