I've said it before, but it bears repeating: For shoulder carry rigs, Robert H (Survival Sheath Systems) is "THE MAN" to contact.
I have a custom shoulder rig Robert made for me that has been worn extensively since I got it from him. That includes "24 hours per day" multi-day stints where the rig wasn't ever removed during extended work-eat-sleep cycles. It is so comfortable, I can forget it's there ..... until it's needed. Then it's exquisite balance of access and retention really shine.
Not only are the rigs top-notch, so is the man who makes and stands behind them. You can deal with confidence when you go to SSS for your rig.
Robert, thanks again for your fine craftsmanship.