The Classic Trijicon Reflex Sight

The Trijicon RX01 and RX30 are battery-free reflex sights powered by the sun and decaying hydrogen isotopes. Unlike a battery powered red dot which stops working when it runs out of battery, fiber optic and tritium powered optics like the Trijicon Reflex just don't work to begin with.

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Amazon affiliate links that have some tangential connection to the things discussed in this video:
amzn.to/3nGm0V0 - Meprolight M21, a current production successor to the RX01