Photo 13 of 68, Colt Model 603 (XM16E1, M16A1 Army)

Early 601/602 used a mag button w/horizontal serrations, replaced w/the semi-circular style, this one is another variant believed to be a very early variant of the semi-circular style, referred to as "many circles".

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XM16E1 mag button "interim" Early 601/602 used a mag button w/horizontal serrations, replaced w/the semi-circular style, this one is another variant believed to be a very early variant of the semi-circular style, referred to as "many circles".
Photo 13 of 68, XM16E1 R Actn Mag Button Interim.jpg, 68KB, 489x420, 2382 Hits Other Sizes: Original
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