If it where purely cosmetic people would not be fighting it. Instead, there is opposition specifically because it is a meaningful, though small change.
A purely cosmetic change would be requiring all guns to be panted orange.
PS: Most people don't have tools or mechanical know how, making 'simple' changes difficult.
> If it where purely cosmetic people would not be fighting it.
Simply not true. People fought the AWB because it was largely cosmetic (not entirely). Even those in support of the bill have said many of the banned items were cosmetic.
> Soon after its passage in 1994, the gun industry made a mockery of the federal assault weapons ban, manufacturing 'post-ban' assault weapons with only slight, cosmetic differences from their banned counterparts.
From the Violence Policy Center, a pro-gun control group.
If a manufacturer can make strictly cosmetic changes to a weapon and have it be compliant, it's kind of hard to argue there was "meaningful change." That's not a loophole, that's banning a cosmetic feature and a manufacturer getting rid of that cosmetic feature.
A purely cosmetic change would be requiring all guns to be panted orange.
PS: Most people don't have tools or mechanical know how, making 'simple' changes difficult.