Just got really interested in the AR type rifles thanks to Billy wink and was looking at the SIG556 Classic have anyone dealt with these or have one if so how are they compared to the Colts, S&W, DPMS, RockRiver etc. in durabilty, reliabily, and accuracy. I her the chrome lined barrels last, but will lose a little bit in accuracy compared to others without the chrome lined barrels. Thnaks in advance.