I have heard the 223 and 5.56 before. I want an AR to fire both the one I was most likley to buy was a S&W M&P sport they were between $650 and 699 around here. DPMS also was one I had looked at I will look at the PSA for sure before I buy sounds like you really like that gun. The two things on the M&P sport I was not sure about was it dose not have a dust cover or a forward assist.