This kit includes all of the parts to completely assemble a bare 40S&W slide (with the exception of barrel, recoil spring assembly and sights).Kit includes the following:LWD-84 - Firing Pin Safety (9/40/357/10)LWD-3439 - Spring Load Bearing LCI 40S&W, .357SIG, & 45GAPLWD-91 - Firing Pin Safety SpringLWD-49 - Firing Pin (9/40/357)LWD-119 - Extractor Depressor Plunger SpringLWD-1148 - Channel Liner (all models)LWD-56 - Spacer SleeveLWD-63-4 - Firing Pin Spring Mid-WeightLWD-1899 - Extractor LCI 40S&W / .357SIGLWD-70M - Firing Pin Spring Cup - MarineLWD-SCP7-BLACK - Unlined Slide Cover Plate - BlackLWD-112 - Extractor Depressor Plunger 9/40/357/45GAP