You will be fine with the sled if you choose to use it. I broke a B-square mount this spring, shooting off sand bags and my shoulder. As far as the gun operatiing, yes it uses recoil to operate the bolt, but the butt resting on something firm causes the bolt to move backward. If you just hold the gun up with one hand out infront of you and shoot it , it might not work right, as the entire gun will recoil backward. You need to have the butt against something firm for it to function, so shooting it in the sled will be of no problem.