...with your extraneous old accessories?

For example, I have a bunch of older stuff like a couple of old MOE handguards and some other random things that aren't worth the cost of shipping even if someone did want to buy them. I can't quite bring myself to throw them away and clog up a landfill, but not sure what else to do with them and they're taking up room in my office.

Is there some sort of Goodwill for gun parts?