Depends on what you intend to do with it, for example, I use an ultradot 2 1MOA for Bullseye. Also have a MK I Target for open sight. The Holosun is a good choice for other uses like target shooting, or small critters, etc. I'm leaning towards a 1 MOA Holosun green dot for the Ruger 57 because it has an appeal for carrying outdoors.
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