The CZ 555 rimfire rifles off shooters tremendous versatility with the interchangeable barrels and magazines, allowing users to quickly change calibers. The replacement 22 Long Rifle Lux profile barrel has a 1 in 9" twist and is 20.6" long. The conversion kit includes one 5-round magazine, magazine well spacer and installation tools. The profile barrel will fit 455 American rifles and 455 Varmint rifles, when used in a varmint profile stock there will be a considerable gap between the barrel and stock. Some fitting may be required.