In a broad sense I agree with you; however, in a limited sense the issue as premised come under the 'automatic' ban which is already effectively a conceded/mute issue...
Yup. In my state, a BMF Activator can't be purchased since it effectively turns a semi-auto into something effectively very close to full auto. I accept that and will live within the law. If we'd ever get into a shooting civil war though, when the law has broken down, you can bet I'd figure out a way to craft one of my own.