I've read that the new Colt's feed most anything reliably. The reason being the modifications they now do to the barrel/feed ramp. I've looked at many new ones and it looks like they take a "rat tail" file and file a circular groove in the barrel ramp interface. They also look like they are done by hand as they vary so much from pistol to pistol. Some look barely touched, some look like they merrily filed away. My question is "If this is all it takes to make a 1911 feed well - why don't others copy Colt?" Sure looks like a simple (and inexpensive) enough alteration.