I would suggest to them that this is extremely important. This is only going to grow. Our firearms laws need to grow, develop and modernize, just like firearms and the firearms manufacturing are modernizing.
Right now, we are regulating a part that can be produced within minutes on a 3-D printer. It can be produced in such quality that it's virtually indistinguishable from the actual manufactured part.
I really do respect the need for a lawful gun owner to want to replace their barrel, upgrade their trigger or replace those components on their lawfully possessed firearm. That's fair enough. They can use the same licence that they utilized to purchase that firearm to purchase those components. What that would do is help us restrict the number of these components that are coming into our country, particularly via mail order and online purchase from the United States, which are going into manufacturing these privately made firearms that are being used to commit violence.