This was posted on the 1911 Forums by a Colt Employee.
Colt parts
MIM
sear
mag catch
disconector
plunger tube
CAST
safety lock
grip safety
FORGED
slide
receiver
barrel
slide stop
MACHINED from bar stock
hammer
all pins
bbl link
bbl bushing
trigger fingure piece
ejector
firing pin
firing pin stop
extractor