If the AG replies in the affirmative to the question "Can you assemble all the parts of a single hi-cap magazine at once, provided they are unassembled?", then how are the retailers at fault? The San Francisco prosecutor would have to establish intent, would he not?
Ayn Rand was right. We've reached a point where every citizen is breaking laws every day, whether he knows it or not. I realized the other day when I saw a squad car in my rear view mirror that I always get a knot in my stomach when I see a cop car, even though I'm not doing anything wrong.