A toy gun that uses air to launch an elongated dart having a rear bore. The toy gun barrel defines a chamber adapted to receive the elongated dart. The barrel has an inner surface which forms a restriction proximate to the second end. The restriction reduces a barrel cross-section. The barrel receives an end portion of the elongated dart therein so that the pressurized air initially pressurizes the rear bore of the elongated dart and pressurizes the chamber outside of the elongated dart between a first barrel end and the restriction as the dart is launched.