Whats with the aliens, I don't get the joke.
Welcome Marc. Although I don't have any specific information about your M16A1, here is a link that has some good information about stampings and identification markings:
biggerhammer.netAnybody know what the star stamping (near front pivot pin) and the "X" stamping by the serial number indicate? could this be a captured M16 entered into the NVA arsenal? This reminds me of Soviet Arsenal stampings on captured German K98 rifles in WWII. I know a number of M16s were captured by the VC and NVA and later recovered, an example is the M16 described below:
1/52 INF 23 INF was a US Army unit
B/123 AVN 23 INF was a US Army unit
Primary service involved, US Army
Quang Tin Province, I Corps, South Vietnam
Location, LZ PROFESSIONAL
Description: The following is an edited extract from the 1/52 Inf S2/3 Journal. At 1038hrs a utility helicopter supporting this unit reported and engaged 3 enemy at BT212101. They were wearing black and were moving SW attempted to evade. Results: 1 VC KIA. 1330hrs a Warlords team reported on station for VR in 1-52 AO. 1420hrs they detained 1 Vietnamese military age male attempted to evade at BT258078. 1450hrs evaced detainee to LZ Professional and hence to Brigade at 1630hrs. 1440hrs at BT258093 Warlords observed 6 NVA wearing green uniforms with packs and 1 weapon. Results: 3 NVA KIA, 1 M16 CIA, 4 hooches destroyed. At BT157087 they observed 1 rucksack. At BT164097 destroyed 1 camouflaged hooch. 1450hrs the Warlords broke station. The captured M16 was SN 886668.
1505hrs a utility helicopter supporting this unit reported observing 3 VC moving west along a trail at BT236119. 1 in blue uniform, 1 in black, 1 in white. All attempted to evade. Results: 1 VC KIA