I recently purchased a DVD on disassembly/re-assembly of a Colt 1911. In the DVD, the gunsmith refered to a "Series 80 part" on slide. This part is absent on my Colt (1968 National Match).
It looked like the Series 80 part was similar to Glock's trigger safety, which prevents firing pin from moving unless trigger is pulled.
The gunsmith also refered to another Series 80 part inside grip. Does anyone know what this part does? (I expect my Colt doesn't have this either. I have yet to completely disassemble it).