Used guns are not a bad thing at all.
Look at your first car. At least most have a used car as their first car. Probably dinged it, dented it, broke a part or several on it or maybe even totally wrecked it. Now change the word Car for Gun. You can get a totally gorgeous weapon, never fired by anyone but you, no scratches on it and factory fresh. Take it apart once and gouge a screwdriver through the frame, or slide, whatever. I was BULLSHIT the first time that happened.
Used gun with fading or chipped Cerakote, or scratches already on it in the same place I would have made them? Dirty uncleaned pistol that someone put 100-500+ rounds through and decided it wasn’t for them? Cleaning product I want to try or just flat out don’t know what I am doing? Used gun is perfect for all those tasks and more. Plus, I feel like it is an animal shelter and sometimes I like to rehabilitate…
Things like field stripping, cleaning and general maintenance have a lot of similarities between makes and models so personally, I would twist up bang up and clean up a USED gun before spending my hard earned money on a beautiful gun I love once I know what the hell I am doing.