The core kit is made up of the following parts:

-Sear Housing Assembly (8900033)
        -Disconnector
        -Safety Lever
        -Sear
        -Sear Housing
        -Sear Pin
        -Sear Springs (x2)
        -Take Down Safety Lever Spring
-Sear Housing Pin / Safety Lever Housing Pin (1301341-R)
-Slide Catch Lever Spring (1300246-R)
-Slide Catch Lever Pin (1300429-R)
-Slide Catch Lever Spring Post (1300876-R)
-Take Down Safety Lever (1302166-R)
-Take Down Lever O-Ring (38000144-R)
-Trigger Bar Spring (1300430-00-R)
-Trigger Stop Pin (1300827-R)

Includes:

• Sig Sauer P320 Non Manual Safety Parts Kit (P320-FCU-PARTS-2)
• Sig Sauer P320 Takedown Lever, Black (1300777-03-R)
• Sig Sauer P320 Slide Catch Lever Low Profile, Manganese Phosphate (1301763-04-R)