People that ask "is that pre-ban?"
Bring a clandestinely blocked Magpul P-mag with you, and see if they have a heart attack. I hate that s**t. I know the laws but I don't go around bothering people in public about them... it's just f**ing rude. Living in this state is bad enough, being constantly reminded about it while you're out shooting is, IMHO, "over the line".
The worst are the handgun compliance numbskulls. "I thought Glocks were illegal in MA.."
-Mike