Installation of these parts kits requires disassembly of your firearm beyond a "field-stripped" condition. Improper installation may result in malfunctions, serious injury, or even death. Sig Sauer mandates that only certified Sig Sauer armorers perform the installation of these parts kits. Any damage caused by incorrect installation or misuse is not covered by your firearm's warranty, and SIG SAUER will charge for any necessary repairs to a firearm damaged due to improper installation or handling of these parts kits. For your safety and to maintain warranty coverage, professional installation is highly recommended.