The EOPS roster and the AG's regulations only affect what guns a MA FFL Dealer can sell in MA. You can lawfully own Glocks, but any magazines over 10 rounds capacity must be pre-ban (9-13-1994). It is easy to tell on Glock magazines, and there are pre-ban magazines on the market including in MA. Glocks manufactured before 10-21-1998 (effective date of current law) that are on the EOPS roster are commonly found in MA gun stores.
If you move to MA, you can bring your guns as long as they are locked in a suitable container. They do not have to be on the "list". You have 60 days to become licensed. Your non-resident license is void upon your relocation to MA. You have no duty to report guns that you already lawfully own. MA still has an assault weapons ban that mirrors the old Federal ban, so no guns with "evil features" unless they are pre-ban.