I just got in some repop DOD Acceptance stamps for retro clone stuff. They're pretty cool. I remember these on our first M16A2s. I don't remember them on my M16A1 but they may have been there.
Charlie's and Reddit and a few other places have some good info if you wanna get some.
charliescustomclones.com
Medium on the XM177

Charlie's and Reddit and a few other places have some good info if you wanna get some.

Defense Acceptance Stamps - History and useage on the M16
The DAS was the official proof mark from DOD acceptance of M16A1 and M16A2 rifles

Medium on the XM177

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