An authentic third generation Glock 19. (the ones in the film were second generation)
The Glock 19 is a 9x19mm Parabellum semi-automatic pistol that appears in one film in the Die Hard Series.
Die Hard with a Vengeance[]
The Federal Marshals at the Federal Reserve Bank of New York appear to carry Glock 19s. The terrorists, including Otto that McClane shoots in the elevator, carry Glock 19s that they took from the Marshals also.