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Rachel, it sure will. The TriStar krx will accept AR12 style magazines and mka 1919 style magazines/drums. So this will fit and function just fine. If interested here's a link to another 10 round magazine I'd recommend over the promag.................... https://www.budsgunshop.com/product_info.php/products_id/127318/sds+imports+t10rdm+replacement+magazine+12+gauge+sds+imports+10rd+black+detachable ...................... Hope this helps.

Hi Rachel, yes but a better quality magazine over ProMag is here : https://www.budsgunshop.com/product_info.php/products_id/127318/sds+imports+t10rdm+replacement+magazine+12+gauge+sds+imports+10rd+black+detachable -- Cheers and stay safe!

Hi Rachel, The TriStar KRX accepts AR12 and MKA 1919 style magazines and drums, so yes this will work. Pro Mag is not known for their quality, a less expensive and more reliable magazine here https://www.budsgunshop.com/product_info.php/products_id/127318/sds+imports+t10rdm+replacement+magazine+12+gauge+sds+imports+10rd+black+detachable , Stay safe & have a great day!