Photo 10 of 68, Colt Model 603 (XM16E1, M16A1 Army)

Here you can see the added forward assist w/teardrop button which began w/the 603/XM16E1, early style XM16E1 receiver w/hole for pin to retain receiver extension, early dimpled pins, the "partial fence" over the mag well which served to give some protection to the mag release button & also held the detent & spring for the front pivot pin, the earlier models, 601/602 did not have the detent & the pivot pin could easily be lost while cleaning.

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XM16E1 right action Here you can see the added forward assist w/teardrop button which began w/the 603/XM16E1, early style XM16E1 receiver w/hole for pin to retain receiver extension, early dimpled pins, the "partial fence" over the mag well which served to give some protection to the mag release button & also held the detent & spring for the front pivot pin, the earlier models, 601/602 did not have the detent & the pivot pin could easily be lost while cleaning.
Photo 10 of 68, XM16E1 R Actn.jpg, 104KB, 782x668, 3733 Hits Other Sizes: Original
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