From what I've read, this challenge will likely fail. For one it doesn't include a TRO (Temporary Restraining Order) to really stop the law from taking effect. It also is only at the lowest level court, and according to other lawyers it's being filed incorrectly.
Sounds like it's going to fail. I hope not but it doesn't look good.
Massachusetts Native (Tough to be a gun owner!)
Owner of: S&W Model 10-5, Beretta 92fs and a Mossberg Maverick 88 "Security" Shotgun