As I understand it, it's not a matter of trying, but complying with Mass recs on guns, which most manufacturers are not willing to do for one state who demands things like loaded chamber indicators and such. Not worth their time and $$$ for one state. That's how it was explained to me at least by the reps at a few gun companies I spoke to a while back.
A pathetic excuse, given the number of manufacturers who are on the AFR. This is especially true if the manufacturer is approved for sale in CA, as most of the CA test is accepted for MA compliance.
Note also that SVI is the ONLY manufacturer on the Target Roster, for which crap like loaded chamber indicators, etc. are not required. Kimber, Baer, etc., would almost certainly qualify - if they bothered to try.