The SIG SAUER P320 factory flat trigger is a direct replacement to your stock trigger. A 30% trigger pull weight reduction compared to the stock P320 trigger. The flat trigger design gives shooters a lower position on the trigger which will increase leverage for a smoother more consistent pull. Installation of these parts kits require 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. WARNING: These parts kits are intended to be installed as a full unit. Any substitution of included parts may be incompatible and may lead to malfunction serious injury or death.