K'NEX Magazine Comparisons - 5.56 NATO, STANAG Magazine
As you see in the pictures below, TD's magazine (yellow connecter - white rod - yellow connecter) is more accurate than the other type (white connecter - green rod - white connecter). The latter version (white connecter - green rod - white connecter) is quite a few centimeters too long, and is more accurate for some 7.62x51 replica K'NEX guns.
The last pic is of my Dad's Bushmaster Carbon 15.
-The Red Book of Westmarch