@1903Collector is incorrect. Lets look at this as a muli layer test.
1. is it C&R?
C&R is inherently pre-ban as far as ASW is concerned and is specifically exempt from the roster if you have a C&R FFL. This will cover most Garands and a lot of the SKS. If the answer to this is YES, then a dealer can sell it to you. No need to look at the rest of the questions.
2. Is it ASW? Pre-ban Y/N? Even if it's pre-ban it will have to have been registered in MA by 8/1. If it's not pre-ban then its an "evil features" test. If it passes as not an ASW, or is pre-ban, a dealer is still restricted to on roster guns. This may be a bigger issue, since those pre-bans will never be on-roster, but that doesn't stop FtF sales.
3. is it on-roster? C&R is exempt to this but otherwise this will be a BIG killer of sales. MA is a small market so manufacturers aren't going to jump in and get all there models on the roster. And anything that isn't in current production will never be on roster. So used guns that aren't registered in MA on 8/1 will be a big no for sales/transfer by a dealer, and no way to bring more into the state. This will absolutely kill the used market, and severely limit the new selection.
So C&R impact isn't much. People seem to be focusing on the ASW ban but the roster is going to have a bigger more damaging impact. It will drive shops out of business and permanantly and radically reduce supply and selection in MA. They played the long game and played it well, if not overturned this law will kill guns in MA in 10 years, you'll end up giving hours to a small shop that has nothing but some old beat up guns and super pricy shotguns.
Hopefully FPC is ready to push a stay up to the fed courts to keep this law shut down until it gets to SCOTUS. MA was my home for most of my life and I haven't given up on MA, as soon as FPC makes their involvement official I'm sending them $$$$ and setting up regular payments, they are MA's best hope.