So your thinking is....... It's a problem indicative of Colts ? Hhhmmm. Might be... Might not be. Might be the problem is ammunition related. Might not..... Might be shooter related. Might not......Might be this and might be that. One thing I'm sure it's not. It's not a Colt thing. It's a controlled feed problem and that you can take to the bank.
3 second Google find.
It's a neck bone connected to the tail bone thing. Miss a vertebrae and your 1911 can't feed. Simple as that. Different 1911 makers at various times in 1911 production have altered feed ramp angles. Barrel throat angles have changed and most importantly. It's hard to feed a round tailored for a push feed system to work in a controlled feed system and vice versa. So,so, many times the problem with a 1911 is a lack of understanding through education, Knowing what a mil-spec 1911 was designed to feed is important. Any 1911 can be altered to feed both push feed oal and control feed oal ammunition by changing feed ramp geometry. Any one can take a working stock factory Colt and make it feed like a well oiled machine gun with some understanding of bullet ogive and oal.
OAL= overall length.
Springfield tends to have correct feed angles out of the box but their extractors are problematic. Today's "O" model Colts tend to feed more types of ammunition than reject. Colt does seem to produce more to trial lawyer proof spec than shooter spec with tight chambers and supported throats. Now, whose fault is that I wonder ? Today's want my cake and it eat too mentality.
McDonalds coffee btw is still too fucking hot but they have a number for you to call now. 1-800-555-MOMA.