Honestly I think its an AR-47, a combo of the AR-15 and AK-47. I dont blame you for the rear sight, i guess. Its actually pretty hard to see, let alone build accuratly. The mag could have better details, too. Dont take my critisism hard, i just want to help you improve. Great build!
Very nice indeed, though the sights of an M4/AR15 need to be removed, they aren't compatible with a real AK47 and the rifle already has its primary sights. Still, a very nice job! Or is it part of the mechanism?