The 9 mm was create in Germany, and came over to America around the middle half of the 20th century. It created a neat little battle between manufacturers that became dubbed “The Wondernine War.”
Holster wear is the universal term used to describe rounded edges and removed bluing from handguns. However, quite often it’s actually something else that wore down the gun.
There are many gadgets designed to help shooters, especially bullseye shooters, but many of these excellent tools are counterproductive, or even down-right dangerous, on a self-defense gun.