Oldie but goodie. Mach Sakai reviews one of the older AEGs in the Tokyo Marui airsoft armoury --- the Tokyo Marui M16A1 Vietnam AEG. A full 1:1 scale replica of thre original, this comes with a 190round magazine with a moveable charging handle. You can use a 2 or 3-point tactical sling to carry this and you can use a higher capacity magazine which you can put inside the buttstock.

Read the full review here and below is the video version: