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Hmm... That's not what I remember the tritium's for... It's not so much as the glow allowing to see the iron sights themselves, but having 3 faint glowing dots that let you line up a target. Think of pistol tritium sights. Even if it's dim, it'll glow a different colour than the background so you can see it.
My ice blue vials glow quite nicely and really bright, so I don't know if your vials are getting old or just the manufacturer?
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