Hardball:
There's no need for Glock to add a manual safety to meet the regs. All they have to do is:
1) install the NY+ trigger (10 lbs or greater).
2) stamp the serial number in a second, super -secret place.
3) add a "chamber-loaded indicator", which can be done with a slightly larger extractor and some red paint.
Which is exactly what Glock told Chief Ron Glidden of Lee, MA, who is the head of the MA firearms advisory board.
Jared