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Ricky, FireQuest makes this : ---- https://www.firequest.com/CM010405.html

Ricky, Yea they are all over the place. Many sites show them out of stock but there are some out there. Put (Remington 1187 20 gauge magazine tube extension) in your search bar and you will have pages of them pop up.

here you go https://www.amazon.com/Carlson-20ga-Remington-11-87-Shot/dp/B085PZWTLX/ref=sr_1_9?dchild=1&keywords=remington+870+tube+extension&qid=1590245537&sr=8-9