Two or three layers of duck tape? Not a very tight fitting barrel, wow! I do the same type of thing, it's called pinning the barrel. I use a piece of aluminum can with rounded corners and wedge between receiver and barrel. There is no question it helps accuracy, with saddle mounts, for obvious reasons. I have a saddle mount and I don't think they are the answer. I would prefer a cantilever mount, but that is what came with the gun. So I pin my barrel.