I have from my personal collection a full size RPB Overstamp MAC 10 in 9mm on a Form 4 in Massachusetts. Excellent condition recently went through and functions well. This a machine gun so unless you have a green card you cannot posses this in Mass. Five mags included. I'd like to keep this in Mass if I can as it will only require one tax stamp. $6800 firm. Cheapest one you'll find around by at least $1000. Cleared funds Including the $200 for the tax stamp start the NFA paperwork. All State and Federal laws will be followed.