Start with this one about US v Miller
[URL unfurl="true"]https://www.law.nyu.edu/sites/default/files/ECM_PRO_060964.pdf[/URL]
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
[URL unfurl="true"]https://supreme.justia.com/cases/federal/us/554/570/[/URL]
Then Ceatano v Massachusettes 2016
[URL unfurl="true"]https://supreme.justia.com/cases/federal/us/577/411/[/URL]
Then NYSRPA v Bruen 2022
[URL unfurl="true"]https://supreme.justia.com/cases/federal/us/597/20-843/[/URL]
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.
[URL unfurl="true"]https://law.justia.com/cases/massachusetts/supreme-court/2024/sjc-13432.html[/URL]