The HK 45 GBB gas airsoft gun has a velocity 325 FPS with a moving hammer, tactical rail and gas blowback realism. This all metal pistol features a 28 rd capacity. Licensed Trademark of Heckler & Koch GmbH Caliber: 6mm Caliber Gun Model: Heckler & Koch HK45 Color: Black Magazine Capacity: 28 Round Velocity: 340 fps