In military terms you would be in condition yellow. (magazine inserted, no round in chamber, safety on)The AR had mag in but chamber was empty (condition 3 maybe? not too sure).
Chambering is just fine, it's the safety you need to worry about. In MOUT training they teach you to keep the safety on until you are actually engaging the target, as soon as the target is down, safety goes back on. clicking off safety and pulling the trigger are essentially one motion. Helps prevent you from blasting your buddy or your toes off in the event that your finger reacts to stress when you are in low ready position.But..if i did look before i chambered the round..i could have been in a bad spot because i would have to take cover again to charge, take safety off, then re-engage target. Id rather look with something that goes bang..rather than look and just have it go click. Im sure you would too..being enlisted yourself