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D. E. this shotgun has a 4rd tube magazine. There are various capacity magazine tube extensions to add more rounds. Example : https://www.ebay.com/p/Factory-Remington-870-Magazine-Tube-Extension-Kit-Adds-3-Rounds-12-Gauge-19422/2254412949

comes with a 4 round mag + 1 in the chamber the are many mag extensions available for the Remington 870