Oh man, I was reading somewhere that all the unusual guns mentioned in the previous post are VERY illegal.
MGL: Section 131N. No person shall sell, offer for sale, transfer or possess any weapon, capable of discharging a bullet or shot, that is: (i) constructed in a shape that does not resemble a handgun, short-barreled rifle or short-barreled shotgun including, but not limited to, covert weapons that resemble key-chains, pens, cigarette-lighters or cigarette-packages; or (ii) not detectable as a weapon or potential weapon by x-ray machines commonly used at airports or walk-through metal detectors. Whoever violates the provisions of this section shall be punished, for a first offense, by a fine of not less than $1,000 nor more than $10,000 or by imprisonment for not less than one year nor more than ten years, or by both such fine and imprisonment, and for a second offense, by a fine of not less than $5,000 nor more than $15,000 or by imprisonment for not less than five years nor more than 15 years, or by both such fine and imprisonment.
Although many coveted Antique Firearms don't resemble typical guns - hence their appeal to Collectors