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Michael, yes, this will work with the Tristar KRX. >>> https://www.integrityarmory.com/2019/10/15/tristar-krx-tactical-magazine-testing/ .....Have a great day!

Michael, yes Sir the Tristar krx12 gauge takes AR-1 Style Drums and Magazines. The slim profile 15rd Drum works as well : -- https://www.budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+275+15rd+drum --- Cheers and Happy Holidays!

yes it will fit and work

Yes, this will fit and function just fine in your krx12. hope this helps.