They make up categories like "assault weapon" and "weapons of war" to try to ban benign, helpful parts of a gun so they can chip away at our rights bit by bit.
P.S. If you want to get a sense of my principles and values in a succinct book, check out The Definitive Guide to Libertarian Voluntaryism over at:
https://amzn.to/33sDMkW
(affiliate)