It allegedly gets issued 4x/year, but if there are no new guns they might not bother re-issuing it.
Best source of info is to call Beretta and ask them directly. They pretty much control the process. Mfr MUST submit gun to one of 4/5 independent labs (if they want to), then send the data to GCAB. GCAB acts on submittals at the next monthly meeting, makes recommendations to the Sec. of Public Safety . . . who can accept them, reject them, or just ignore them. If approved at that point, it gets published at the next publication date and only then can it be sold in MA (to LEOs only, see below addition).
ETA: The above is "phase 1". Then the Mfr must certify that the gun meets the AG Regs before it can be sold in MA to civilians.