The conversion unit includes all the necessary parts to convert a standard M1 carbine into a fully automatic M2 carbine. Also includes some extra parts including a bolt, rear sight, spring, magazine, stock, and hand guard. NOTE: This weapon is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) that is classified as a "Curios or Relic" as defined in 27 CFR, 478.11. These weapons are still subject to the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 479.