Just bought an ar15 with a 5 round mag. It is a C products ss mag. The thing is it easily holds 10 223 rounds. I am happy about that. I just want to make sure it is supposed to and wont have feeding issues. I would think it would only hold 5 if it was a five round mag correct? Once again I am happy with the extra 5 rounds just want to make sure. It is not a new magazine it came with the rifle.