The single-shot firearm, which resembles a pen in size and shape, was found during X-ray screening of the man’s luggage at about 1:30 p.m. on Aug. 13, a representative for the TSA confirmed. Massachusetts State Police were called to the security checkpoint, where they interviewed the passenger. After speaking with police, the male traveler was allowed to continue through the airport and ultimately to his destination in Portland, Oregon — sans pen gun. He also would have been allowed to transport the item had he packed it properly in his checked baggage, the TSA said.