80%'s are interesting. And fun.
You have two sets of laws you have to be aware of, (and then you can choose to comply or violate).
I can take an 80% lower and complete it for my own personal use without violating any state law here in Georgia and without violating any Federal law.
Yet, the same actions violate CT law because CT says I'm not allowed to have any NEW AR's...
I'm not sure what the Massachusetts state laws governing your actions are, you'll have to figure that out, particularly with Maura's BS.
I can tell you this - the ATF says that YOU must do the work yourself. If I do the work for you, then I'm a manufacturer, and since I'm not licensed, and I'm not a FFL, I'm violating ATF regulations. They frown upon this.
My suggestion to you is to find a friend with the jig set who has his own 80% to do, go watch him do his, then do yours using his equipment while he watches/coaches. But do your research about what the ATF considers legal, they really don't have a sense of humor from everything I've read and heard about them.
I have a set of the jigs. I use a small milling machine to complete my 80%'s, but it can be done with a drill press and a router.