The m16acog has a glitch where when you switch it to automatic sometimes it will only be shooting semi automatic and appear as if you are shooting automatic. If your looking through the scope you will never notice but if your watching your ammo you will notice its shooting one by one. The only way ive found to fix the glitch is to re-equip the weapon, Im not sure if youve been notified of the glitch yet or not but I figured i might as well say something.