I'm considering which handguns to keep and let go. I have an original Glock 26 back from my campus police days almost 25 years ago. Investigating the differences between generations, I noted there is some griping regarding Glock's change to how they applied the tennifer finish and some people believing it makes it less durable. I have no idea about any of that, but in general are there certain generations / models that if you own, you pretty much would be stupid to sell?