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Hi Kathleen and welcome. The Holosun 507K X2 is a compact red dot sight that is designed specifically for use with subcompact handguns like the Glock 43X MOS. It offers a clear, easy-to-see reticle, and its battery life is long-lasting. Cheers and stay safe!

I second James G's recommendation. I own a 43x Mos and the Holoson 507K is exactly what I'm going to get. Also, with a lil gunsmithing, you can mount it directly to the slide with no need for an adapter plate!