AR upper legality.

[Deezul]

Looking at a post ban AR upper for use in MA. I know it can't have a bayo lug or flash hider/compensator that is threaded. Can you have a permanently mounted muzzle device? Soldered / pinned?

 

[Donvin999]

You can have a compensator but not a flash hider and it must be permenantly attached. Pinned/soldered good luck!