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Lyman, this will work in any caliber AR lower receiver. The trigger is not caliber dependent. Cheers and stay safe!

This will work in any Standard AR15 Lower. Binary triggers are kind of cool but honestly I like the "Graves Automatic Reset (A.R.T) Trigger is much faster and more controllable. https://www.recoil-technology-systems.com/graves-v2-art.html#/ ------------------ Or the Rarebreed FRT15 https://www.rarebreedtriggers.com/ ------------------ Or the Rise armament RA535. https://risearmament.com/product/rise-armament-ra-535-trigger/

any AR lower caliber does not matter

Lyman, the trigger is not caliber specific, it will work in any AR15 lower. Have a great day!