Grip screws? Trigger bow? Mag release?
On a 1911, those are the main things. Oh yeah, some mags are made thicker too.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)