If you are ever stopped in your vehicle by the police for suspicion of being under the influence of alcohol or drugs, and you have a loaded firearm in your possession or control, you may be charged with a separate and more serious crime under MGL Ch. 269 Sec. 10 H. That crime carries a$5,000 fine and/or 2.5 years in jail. There may be legal defenses to your case, depending on the reason and validity for the stop and/or the location of the firearm inside the vehicle.
If you ever have any questions, please call me at 508-243-4877. Doug Stoddart.