I found this information a while back on the Bungie site and thought it might be helpful for anyone trying to reproduce the assault rifle from Reach. I tried to find this article again in their archives, but had no luck. Trying to scale things from pictures and video games can sometimes be difficult. Having this "so called" hard data where they actually give dimensions is a plus. In the picture I downloaded, you can see the length, height and width . According to the guy who made the metal framed AR for Bungie's motion capture work, each square on the grid equals one inch. He mentioned that if you enlarged the image to 36 x 16, you would have the right scale. There has been a lot of speculation on the different sizes of the AR line. To my mind, the whole point of a bullpup design is its compactness.