PLEASE, ask ANY and ALL questions you have before you place an order! The kits are made of 41/40 steel The Glock Conversion Kits are 100% legal to own. The Glock kits come with "instructions" (JnC Manufacturing will not assist any individual or NON-SOT licensee in the completion of these kits) These items are not ready to be installed! There is machining required to each part! A FFL/SOT is required to complete or be in possession of a completed unit. JnC Manufacturing sells these kits as collectors Items or Novelty items.