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Christopher, the Remington 870 extensions will work. ATI used to make a +3 but any 870 Extension should bolt right up : https://www.youtube.com/watch?v=u2OhofpznY8&feature=youtu.be ------ (https://www.ebay.com/p/2255375131?iid=264839609609)

Christopher, Here are a couple magazine extensions that will work in stock at BUDs---------- https://www.budsgunshop.com/product_info.php/products_id/96015/wilson+sgetu2+extension+tube+rem+870%2f1100%2f11-87+12+gauge+2rd+steel+black+parker ------------------https://www.budsgunshop.com/product_info.php/products_id/87475/carlsons+04506+870%2f1100%2f11-87+12+gauge+7+rd+extension+black+

Christopher, Beside the 2 tube magazine extensions I gave you in my previous answer. Here is one extension BUDs carries that will make total capacity 10 - 2 3.4" shells in this Tri-Star--------------https://www.budsgunshop.com/product_info.php/products_id/713077324/carlsons+magazine+extension+10