UMAREX IWI MINI UZI 4.5mm BB The Mini UZI features a strong polymer build. The stock folds to compact it down for easy transportation. To further the authentic look the IWI features a blowback action giving it a slight kick. The muzzle has a thread to allow a silencer to be fitted again adding to the look of the gun. This is ideal for anyone looking to do plinking or for those who have a keen interest in replica guns.