I have used a Remington 870 for many years with no camoas stated above it's all in staying still, if your not moving they cant see you, a non camoed gun just looks like a black stick in the woods.

I saved my first wing, put boraxon the fleshy part (where it comes of the body) the next season I used it hunting. At fly down Ihit it against bushes and a tree to simulate a hen flying down and some times at the same time I will do a fly down cackle with a mouth call, works great! they think they have a hot one!