Bit of a story here-
My great grandpa was a market waterfowler in the early 1900s, and Dad would often talk about how they'd duck hunt.
They'd select whatever slough would flood along the river and brush up a blind area. They would set up their blind right in front of a sapling tree, which they'd cut off a foot or two above the ground.
When they headed out to hunt in the morning, they'd grab a couple live hen ducks from the pen, and tie/anchor them in the slough so they'd lure in the ducks. If they got shot, no problem.
Well, Grandpa's double barreled 8 guage had some kind of metal loop (sling swivel?) somewhere on the forend or barrels, and he'd attach a small chain to his gun there, and the other end he'd attach to the small tree in front of the blind. Once a bunch of ducks landed in front of the blind, he'd pull the chain tight so the tree would act like the limb of a bow and soak up some of the recoil when he pulled both triggers. He also kept his Winchester 1911 handy (one of the first automatic shotguns) to clean up any cripples immediately after the initial blast.
Dad didn't get to buy all Grandpa's guns at his estate auction. He did get Grandpa's Winchester pump action .22 short, which accounted for scores of geese, and his Springfield trapdoor 45-70 carbine. Still, I would love to see that 8 guage.