An early M16A1 that I have come across today.
Items of interest are the DoD acceptance stamp,
tear drop forward assist,
C MP C barrel markings on the bottom of the barrel.
The Colt AR-15 Resource
"A site dedicated to the history of the Colt AR-15 rifles, carbines and associated items"
The Colt AR-15 Resource 
I recently purchased a M4 Commando, Can you do a parts disassembly and description? Or if you have one, would you re-post it? I’ve seen some you’ve done before and was hoping to see one on the Commando. Thanks! Love your articles,
Harold
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