I consider custom, is something built specifically for you..
With that said some of us that have not got very much money like I mean regular people. We get excited that we can rattle can our stock or afford a timney trigger heck if we can afford a break to be threaded on. That is a special thing it something to talk about and it's just a bit better than your buddies rifle.
With that said I do not believe it should be marketed as custom just AFTERMARKET. The word custom just sound more up class for us to say.