You mentioned slings in a previous post.
As for rifle slings, after using a bunch, the best turned out to be an adjustable two point sling from Viking Tactical(Vtac)
I am unfamiliar with this particular sling. I have always favored the old M1907 sling. “Slinging up” and locking yourself into it does add a measure of stability to your shooting, especially offhand. Have you ever practiced using the ’07 sling? With practice, you can go from regular configuration to ‘locked in’ in about 15 seconds.
Just because it’s old (like us ) and there’s other high speed stuff around doesn’t mean it’s not useful…
The wicked flee when none pursueth..." - Proverbs 28:1