The HK VP9 features a crisp blowback action thanks to a full-metal slide. The magazine holds 14 rounds of 6mm airsoft BBs and a 12g CO2 cartridge which allow the HK VP9 to achieve up to 320 FPS muzzle velocity. Fixed white-dot tactical sights keep you on target, while a 20mm accessory rail allows the addition of tactical additions. Drop Free High Capacity Magazine 330 FPS with .20 gram 6mm airsoft BBs Uses one 12 gram CO2 capsule White Dot Combat Sights Manual safety Two Stage Trigger 14 Round Capacity Adjustable Hop-Up   Notes: The Elite Force HK VP9 CO2 takes magazine part number 2275048.