I've affixed a red dot sight to my 1187. I bought it for hunting deer this year but I went goose hunting with it on Saturday and wow, I felt like I was cheating. Had a group pass right in front of me at about 35 yds and it was like playing a video game. Place the dot in front of a bird, slap the trigger and watch 'em drop.
It seems to place slugs pretty accurately too. I appreciate that it doesn't blot out the target. Note that I haven't shot at a deer yet but I sure did appreciate how easy it was to line up the barrel Saturday.