I have not noticed any kind of gun sinking down on the front of the Lead Sled. It has a firm front rest that is covered with vinyl/leather/pleather typed material so realistically there is no chance for the gun "sinking" during/before the shot. It really is like shooting off of sandbags except you have adjustability and a bit of recoil reduction built in. Personally, I would not spend the extra amount for the dual frame. The original soaks up a lot of recoil.