I was thinking the same thing 8bitninja! Was planning on ordering a bunch of the vials anyways for a side project, might as well see if it's feasible to do that. Durability is the hard part; by drilling into the sights, we're thinning out the metal dangerously. Plus, the front sight would be a bitch to mount a vial to. I think glow-in-the-dark paint is probably the most feasible option honestly.
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