Simple comparison of glass and reticle of these popular circle dot type optics. Sorry about the poor focus on my phone camera but it is all I had. Things to take note of here: Max Brightness ability, Clarity of glass, Parallax, Field of View. Poor brightness and reflective glass of the 510c created a problem in angled sunlight or aiming and very bright objects more so than the other two by far. 503gu outperformed the 510c in harsh lighting conditions with the EXPS2 glass showing near zero problems with harsh light. If one could not afford the EXPS2 I would purchase the 503gu over then 510c after first hand testing for me. The EXPS2 performed very well and the clarity of the glass was even more important when combined with a magnifier I was very impressed. Non-magnified I am not certain I would spend the extra of the EXPS2 over the 503gu but magnified there is no question it is worth the extra.
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