The holder of the gun had no ill intent and was legally permitted to carry it, and Robert Gursky, 50, was arrested after alarming the staff of the town's TD Bank branch, police said.
"He (Gursky) was trying to relay to the teller (that) someone had a gun," Glastonbury Police Agent Kevin Szydlo said, which included writing a note to a teller with the word "gun."
The teller and other bank staff became alarmed and activated the bank's robbery protocol. Police arrived, tracked down and interviewed Gursky and arrested him, the Hartford Courant reported Tuesday.
Gursky was released on a promise to appear in court Sept. 25.