The Wilson Combat Lower Receiver Small Parts Kit does not include any fire control parts (Hammer, Trigger, Disconnector, Springs), or the buffer retainer spring. It will only include:
Bolt Catch
Bolt Catch Plunger
Bolt Catch Roll Pin
Bolt Catch Spring
Magazine Catch
Magazine Catch Spring
Magazine Catch Button
Pivot Pin
Takedown pin
2x Pivot/Takedown detents
2x Pivot/Takedown detent springs
Safety Detent
Safety Detent Spring
Semi-auto Safety selector (Right Hand)
Trigger Guard (Aluminum GI)
Trigger Guard Roll Pin
2x Trigger/Hammer Pins