It's a bit more complicated than just having a list of non-prohibited guns (what did you expect? - this is Massachusetts).
First, the EOPS list that you have the link to is for guns that are allowed to be sold by dealers (i.e., by FFL holders) - guns not on the list are prohibited for sale
by dealers. There is no prohibition on sales between individuals - Massachusetts residents are allowed 4 FTF transactions per year, each of which has to be reported to the state on a FA-10 form. Although they don't use the term, this amounts to gun registration. Any gun legally in the state may be transferred this way, just as long as it doesn't go through a dealer. As you might guess, prices on guns that are not on the EOPS list are somewhat inflated here.
Guns not on the list can sometimes be legally transferred or sold by dealers if they are grandfathered - i.e., if it can be proven that they were legally in the state before September (I believe) of 1994. There aren't too many of those because they tend to be transferred privately with the FA-10, but you do run into them sometimes, and also sometimes at dealers out-of-state, and as you know those guns need to be transferred through an in-state FFL.
Now, here's the part that drives those of us trapped in this commie hell-hole crazy: In addition to the EOPS list, a gun also has to be judged "safe" by the Attorney General's office under the Massachusetts Consumer Protection Laws. It's not entirely clear what the criteria for "safe" might be, but among other things they include weight of trigger pull, presence of a safety device, etc. The only problem is, there's no list available, nor will the AG provide one if asked, and simply because a gun might be on the EOPS list doesn't mean it's also on the AG's double-secret probation list. So, dealers are sort of left to twist in the wind and some of them won't deal with certain guns even though they may be legal to sell.
Anyone relocating to Massachusetts - which may incude you? - is allowed to bring in their guns (as long as they don't violate our AWB ban, which is a whole 'nother story), but they have to be registered and are then considered legally in-state, whether they are on the EOPS list or not. So, if you're moving here you can make a few bucks by buying some expensive desirable guns not on the list - Colts and Kimbers come to mind - and then legally selling them at inflated prices via the FA-10 (remember, only 4 per calender year) once you get here. Just make sure you don't have any large capacity magazines manufactured after a certain date (which I can't recall at the moment) - those are prohibited under the AWB, and simply possessing them is a felony.
Does your head hurt yet? Well how about this - most of us who are serious about gun collecting here know one or more FFLs who openly flaunt the law and will sell or transfer whatever you might want. They're trying to get the AG to take them to court so they can fight the law and have it declared unconstitutional. The AG is concerned they might win, so refuses to acknowledge that they're out there, but they clearly know they are.
Yes, it is insane, but this is what happens when you have a one-party dictatorship for decades. Best advice? - don't move here under any circumstances. If you've got a job offer, consider moving to New Hampshire and commuting. I've got another year or two before I retire and I'll be getting out of here so fast it'll take weeks for the dust to settle.
Much, much more information and advice, some of it from attorneys, is available at the Northeast Shooters Forum -
www.northeastshooters.com
Yes, I'll simply organize and change things for the better! I can then use that model to fix the country, by golly!