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Got E'd about this, so it must be a mystery to some folks. Here goes,and this applies to most shotguns, but pumps are what I use....
Most folks have some kind of basic pump, say a riot type with plain bbl and bead sight. Mount the gun and place the bead on the machined strip on top of the receiver in the middle.Neither hide the bead nor let any bbl show between bead and strip.
If the bead is mounted directly on the bbl without any ramp/base, the thing WILL shoot high, maybe a foot at 50 yards or so. Hold low and fire off enough to know where it hits. If it has a base, aim straight on and see where the impact is.Vent rib bbls should be treated the same.
Some bbls have a mid bead also. Get a sight picture that has the beads superposed, or stack them into what looks like the figure 8.
In the decades long evolution of my slug shooting 870s, I used a plain bead for a while,and did OK out to 50 yards. I hunt close, and the setup was adequate.
Hope this helps...
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