Focusing on cosmetics is silly, and some advocates of restrictions would just as soon see all guns gone, but I think most people just want to see common sense applied.
I think you have not talked to many gun fans. Exceptionally few crimes have been committed with legally and privately owned fully automatic weapons, so I see absolutely no reason why those laws should be revised. Your issue is with the illegally owned guns, and I think that few gun fans would object to enforcement of those laws.
I cannot think of any crimes committed with a legally owned RPG. Clearly the regulation for RPGs that is already in place is sufficient.
Today, you can purchase an SKS from a federally-licensesd dealer after a NCIC background check. You can then take that gun home and replace the magazine with one made in the United States, and no law is broken. Replace it with an identical magazine made in Poland, though, and you've committed a felony under 18 USC § 922(r), and if convicted face up to 10 years in prison.
The laws surrounding the ownership of arms in the United States are onerous and Byzantine. I've spent a great deal of effort doing my best to comply with those laws in order to exercise a right that's protected under the federal constitution.
Forgive me if I no longer treat "But we can compromise!" as a valid argument.
I worry when Governments go out of their way to disarm their citizens; even if they're benevolent at the time, they often don't stay that way. Look up the history of disarmament in pre-WWII Germany and Russia.
The fact that a comment like yours always appears is a large part of why we can't ever have discussions about reasonable regulations.
Hell, where I live there are people who literally argue that property owners should not be able to decide whether to permit what are essentially armed trespassers, since that might infringe on someone's "right" to be armed on your property.