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For the mossberg, eject the spent shell, 'surf the shotgun' aka roll it over forcefully so the next shell on the elevator exits the ejection port, and stick your slug in, slide home, and insert more shells in mag tube.
Anyone seen the Thunderranch video on defensive shotgun? I just find the Magpul vids to be mall ninja. Thunderranch dude is more down home and practical with a good sense of humor. Less emphasis on gear and more on the operator. Goes over using a single barrel or grampa's quail gun effectively including modern black shotguns.