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Mepro M21

Probably Not.  Your optic has multiple settings for you to choose the correct brightness for any situation. Most people tend to set the reticle brightness too high, which will cause a halo.  It should be just bright enough to see without distracting you or unnecessarily obscuring your target.

The tritium in night sights, Mepro FT Bullseyes, or in the Mepro M21 or Mepro MOR cannot be replaced or recharged. The sight or optic will still work just fine in lit conditions, but will not illuminate in low or no light conditions.

Our tritium illuminated night sights and optics should last about 15 years before the tritium naturally degrades.