Since this seems to be the most active current MA AWB thread...
I'm contemplating the tradeoff in comfort vs the utility of being able to spin off a muzzle device or use a FH. It seems to me from my readings of the laws that removing the pistol grip would allow that.
Is that a safe interpretation?
If so, which would this be sufficiently non-pistol-grippy?
http://www.riflegrip.com/#
http://www.thordsencustoms.com/frs-15-stock.htm (note: http://www.thordsencustoms.com/feature-restricted-states.htm)
http://ar15spur.com/
Have fun with that.... we had a thread about this several years ago.... nothing definitive came out about it in the end, though.
http://www.northeastshooters.com/vbulletin/threads/15954-Thumbhole-stock-on-AR15-to-gain-flashhider
Course even if the thumbhole is/was legal, there really aren't any vendors making them for AR15s anymore, for obvious reasons.
-Mike