This is an interesting product from Copper Basin that can be useful in securing the rifle to your body when you need your hands free even if you already have a sling to help you carry it... "The Pak-Rat Quick-Clip is the ideal accessory for hunting or any outdoor excursion, securely holding rifles, shotguns, decoy bags, duffle bags, canteens and binoculars on your shoulder – no more slipping. Your gear is kept securely in place on your shoulder, leaving your hands completely free to climb and maneuver.

The Rifle/Shotgun Support System combines the Quick-Clip, Pro-Linx Sling and Rat-Tail Stock Support. Together they keep your firearm supported against your hip and secure on your shoulder, giving you increased mobility as you walk and leaving hands free to maneuver. Stay relaxed, comfortable, and in the field longer."