@jonconsiglio thanks for the post. I'm very new to all of this so opinions like yours is very helpful.
I'm a disabled vet so dollars are an issue. Primary intent for purchasing an AR -- SHTF situation. No matter what I purchase I will do the break in then spend a few hundred rounds getting familiar with the weapon. Then, every month I plan to go shoot a hundred rounds or so just to keep the memory.
I'm able to purchase these from a dealer who only sells to LEO and Military. I can purchase a S&W M&P sport for $520 or a Rock River LAR-15 CAR A4 for $825. I have no idea why the price difference. In view of my need/want is the Colt that much better than the S&W or RR? Any insight is greatly appreciated.