When I took my last low light class, several of us did not have night sights. If there was enough light to identify the target as a 'shoot', there was enough to see the sights. And us guys without night sights were shooting comparable groups the the ones we shot earlier in the daylight.
Remember it is seldom 'pitch black' anywhere. There is usually some ambient light. Some of my older pistols still have night sights on them, but I haven't put any on my newer guns. I doubt I'll be replacing the older ones when they give out.
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