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Jeff, yes sir, this fits both the cz 457 and 455 in 17 hmr. Hope this helps.

Hi Jeff and welcome. Yes Sir. https://www.cz-parts.com/cz-457-cz-512-cz-455-polymer-magazine-.22-wmr-/-.17-hmr-5rnd

Jeff, yes this will fit in your CZ 457. Stay safe & have a great day!