They do wear out eventually, but the end of their useful life is a whole crapload of rounds if they’re well-made, and most good guns can have parts replaced either by the user or by a smith, so you can keep them running a long time if you oil them and keep them relatively rust-free. If a gun is so messed up it can’t fire or if it fails catastrophically and blows up, if it’s truly and permanently at the end of its life, I think most folks do indeed throw them in the trash, assuming they have no historical value. Maybe disassemble them or cut them up with a hacksaw first. Once it stops being able to be a gun anymore, it’s just junk.

Do you know any Linux users that aren’t IT professionals? If I know any, it’s because they’re the children of IT professionals

Guess what Edge and Chrome do if you make Firefox the default browser? They all harass you if you run them when they aren’t the default. At least Firefox respects the “don’t bother me about this again” checkbox