Sig Sauer P320 Sig P320 9mm Luger 357 Sig All the factory replacement corrosion-resistant parts to complete your P320 slide, minus barrel, sights, and recoil assembly. Includes: Extractor, Extractor Pin, Extractor spring, Extractor spring pin, Striker group assembly, Rear slide cap. Installation of these parts kits requires disassembly of your firearm beyond a field-stripped condition. Improper installation may result in malfunction, serious injury, or death. SIG SAUER requires that only certified SIG SAUER armorers install these parts kits. Any damage caused by the incorrect installation of these parts kits are not covered by your firearms warranty, and SIG SAUER will charge for any needed repairs to a firearm damaged by improper use or installation of these parts kits.