What do you mean nothing to break? Those tritium vials are contained by glass... There's always the chance of a strike by a BB or a surface and it might shatter. That's why the paint might be a more feasible option.
As for the MBUIS, interesting... That will be really low profile though, dunno how well you can sight in without risers on it. Yeah, I can definitely see the tritium vials working with that, just might be a little too exposed in my opinion. Plus, if you flip up the sights, you'll be a nice glowing target to shoot at :P
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