Here is a good article from Dave Kopel.
The Ninth Circuit case Rupp v. Becerra challenges the California legislature's ban on a wide of variety of rifles. Last week, I co-authored an amicus brief explaining: 1. Supreme Court precedents state that common arms cannot be banned. 2. Lower courts have used several methodologies to decide whether a type of arm is "common"; under any methodology, the arms targeted by California plainly are common. Therefore, prohibition is unconstitutional.
https://reason.com/2020/02/12/what-arms-are-common/