Recoil was probably less than an 1100 but noticeably heavier and only single shot. The magazine tube is blocked by that weight contraption. That's very likely why they didn't sell. Why buy a single shot 1100/870 hybrid when you can buy a lighter 1100 trap and shoot doubles for probably less money. I don't know what the 870 Competition sold for new but I bet it wasn't cheap. That barrel assembly probably weighs twice as much as an 1100 barrel. The adjustable comb wwasn't factory, someone added that before me.
I honestly never noticed a difference between that and my 870 tc trap. A gimmick IMO