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There is a difference between TruGlo TFO's and the regular fiber optic TruGlo sights. The TFOs are fiber optic with tritium inserts so they will still glow in total darkness. The regular ones are just fiber optic rods so they need some light to glow. I believe the TFOs only come in all green and green rear/yellow front. The regular ones without the tritium come with the option of green rear/red front. My recommendation would be to go with the TFOs because they glow in complete darkness. The yellow rear with green front are nice for some contrast and slightly quicker front sight recognition.
 
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