just to let you know I bought a Remington 870 with the plastic stocks and took off the recoil pad , the stock bolt tightens on a long tube in the stock and that tube was smashed under the bolts torque. I would have to believe over time shooting this with 3.5" shells it would fail. I filled my stock with fiberglass resin to the top of that tube and made a bigger washer , well more of a long plate with a hole in the middle, to cover that tube and the resin. Just letting you know you might want to check yours, when you take that pad off you will see what I am talking about. Don't know if 11-87 are the same or not.