The drop safety keeps the striker from hitting the primer if the gun is dropped. Dropping a gun with a compromised drop safety can lead to a dead trigger, dented primer or, worst case, an ignited primer (ND).
This video explains what to look for:
https://www.youtube.com/watch?v=S_MEVIhMz5E
I still think that dropping the gun is important. My standard test is to load a magazine mostly full, top it off with dummy rounds and chamber a snap cap (some people use an empty, primered case). Then I drop the gun onto my (carpeted) basement floor from waist height, trying to get it to land on the back of the grip or beavertail area. If you pick the gun up, pull the trigger and it goes "click" like normal, then you're good-to-go. If you have a dead trigger, then you have problems.
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