The same ones can be seen in the
010 Armalite AR-10 Presentation,but in better quality detail,also brochure images of the other prototypes (X01 and X03 AR-10A),also a drawing concept representation of the X03 AR-10A as one can see that in the original concept it was to use the same type of dust cover used in the X02 (the one in the image),in reality it as the frame over the left side but no dust cover was ever used.
010 Armalite AR-10 Presentation
"12 pages from the Armalite Corporate presentation on the AR-10 (identified as a part of Fairchild with a Los Angeles address). Overview of AR-10A (3 pages with pictures). Economy of Manufacture. Simplicity of Takedown. The Straight Stock Principle. The AR-10 Automatic Rifle. The Original Prototype (BAR magazine). The Second Model. General Description AR-10B. Heavy Barrel. Bipod LMG Model (crude sketch only)."