I love my XS sights on my 870. Slugs and buck are dead on at 25 yards, but slug accuracy seems to become erratic after 25 yards (as opposed to my ghost ring sighted Mossberg). Expect 5" patterns at 15 yards with FliteControl/Versatite wad ammunition and 12" at 25 yards. Note that the IC choke opens FC patterns a bit compared to cylinder (5" vs. 3" @ 15 yards), but it's kind of a good thing for home defense, IMO. My crazy over bored cylinder 870 barrel shoots 4" patterns at 50 yards with #1 FC, which is a bit much.