Im looking to build my first AR and im looking to get schooled on MA rifle regs please. I know about fixed stocks, flash hiders, and bayonet mounts are not allowed. I searched, Is there a Sticky or a link i can refer to and learn about Do's and Don't's? Are there compliancy on certain parts? Im not looking to settle on the cheapest and really want products that as my knowledge grows i wont be looking to upgrade right away. Thanks im looking forward to the help!