This JE Machine lower parts kit includes the upgraded pieces from Sigs'voluntary drop-safe recall. This kit is completely compatible with any upgraded Sig P320 slide in 9/40/357. This kit will not work with the .45 ACP Sig P320 or a .45 80% build as there are a few pieces that are different. IncludesLightweight Adverse TriggerSear HousingSearSafety LeverTrigger BarTakedown Safety LeverTakedown Lever with O-RingMechanical DisconnectorTrigger Bar SpringSear Spring X2Takedown Safety Lever SpringSear Housing PinTrigger Bar Stop PinSear PinSlide Catch Lever PinSafety Lever Pivot Pin