Originally Posted by
26 Inf
On a pump gun the Remington LE armorer guru, Lyle Wheelock, taught to adjust via the mag tube. I've done it on the range using a receiver hitch receptacle on the back of our range van.
I'd have to see you in your shooting stance, but shooting high is a pretty common thing for folks who bury the stock in their shoulder. To mount the shotgun keep your head erect, bring the comb of the stock up until it hits your cheek, and then back to the shoulder. The range mantra is 'head erect, up to the cheek, back to the shoulder.'
The flat portion of the upper receiver serves as the rear sight plane on non-ribbed police/HD barrels, the bead should appear to be sitting on the rear sight plane, just as the sun appears to be sitting on the edge of the world as it begins to drop below the horizon as seen in the South Pacific.
Check to see if you are doing that.
Good luck.