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Hi Emmanuel and welcome. I recommend getting a box and testing. If it runs then stock up, if not, just single shot away and move on. Cheers, stay safe and enjoy! The SP 12 is supposed to be a close Mossberg 500 design, and the mini-shell adapter is here: 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