Start with this one about US v Miller
It’s a terrible case, handpicked to rubber stamp the National Firearm Act of 1934, and still would supports the 2nd Ammendments protection of AR15s.
Then DC v Heller 2008
District of Columbia v. Heller: Private citizens have the right under the Second Amendment to possess an ordinary type of weapon and use it for lawful, historically established situations such as self-defense in a home, even when there is no relationship to a local militia.
supreme.justia.com
Then Ceatano v Massachusettes 2016
Caetano v. Massachusetts: The Second Amendment covers all weapons that may be defined as "bearable arms," even if they did not exist when the Bill of Rights was drafted and are not commonly used in warfare.
supreme.justia.com
Then NYSRPA v Bruen 2022
New York State Rifle & Pistol Association Inc. v. Corlett: New York's requirement that an applicant for an unrestricted license to “have and carry” a concealed pistol or revolver must prove "a special need for self-protection distinguishable from that of the general community” is unconstitutional.
supreme.justia.com
All these cases are building blocks SCOTUS has used to arrive where they are today on gun rights and if they found a ban on AR15s Constitutional, they would be going 180 degrees in the opposite direction.
Then check out Canjura as Pastera suggested, and you will see that even the Mass SJC is evolving in favor of the Second Ammendment.
The case involves the defendant, David E. Canjura, who was arrested by Boston police officers on July 3, 2020, after an altercation with his girlfriend. During a search incident to the arrest, officers found a spring-assisted knife on Canjura. He was charged with carrying a dangerous weapon...
law.justia.com