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Hu Johnny and welcome. They will not run reliably in the 870. The OpSol Mini-Shell adapter is for the Mossberg I believe: https://www.budsgunshop.com/product_info.php/products_id/36595/opsol+texas+miniclip+mini-clip+for+mossberg+500+590+12+gauge+1+round+polymer+black+finish ----------------------------- https://www.msgo.com/threads/mini-shotshells-in-an-870.163382/

they will work as a single shot. they will not cycle. no adapter is made for the remington 870