I used to see people with rifle scopes on their M4 and it didnt look good, nor was the function their. A rifle scope on an AEG is pretty much pointless. From actually handling an M4 with a scope, i can say your accuracy is less with one, then if u just used your iron sights. Watching people spend hours sighting it in is also not worth it. Stick with an ACOG with 1x or 2x magnification. I had a replica red dot ACOG for a while and i loved it. It also looked much better on my M4.