The 220 series Sig's have a GAZILLION small parts in the lower and pretty much ever part on the gun has its own spring. The springs for the slide stop are thin and they do break on very rare occasion.
Gazillion parts in a Classic P Series Sig Sauer?
B.S.
Take Down Lever
Locking Insert & Slide Lock Spring
Trigger Lever & Pivot Pin
Slide Stop Lever
De-cock Bushing/De-cock Lever & Spring
Trigger Bar & TB Return Spring
Sear,Sear Spring,F/Pin Safety Lever & Pivot Pin
Hammer & Pivot Pin
Hammer Stop,Spring & Pin
Mag Stop Plate,Mag Catch,Spring,Catch Stop & Spring
Fewer parts in a DAO or DAK
Not a 1911,but re-buildable in less that 20 minutes if one has any mechanical aptitude.