How about someone actually states what's wrong with them? Maybe it's because it's on my phone, but I don't see a quantifiable difference between the dpms and colt feed ramps both pictured in this thread. Someone asks what the difference is and people say if you can't tell, then read more. Why not help educate them?
It's bugging the crap out of me that I can't tell what's wrong with them. It's hard to tell, but it looks like the left one is not a smooth transition receiver to bbl ext.

