Contrary to most beliefs, During Vietnam War, the M16 did receive official consideration as a Sniper Rifle.
M16 was fielded into the combat with many different types of scopes, but in the end, troops favored Colt 3 power scope most.
So let’s see how effective this setup actually is!
Note: During Vietnam War, M16 in Sniper Setup was sometimes paired up with Sionics MAWA1 sound suppressor, but I don't own original Sionics can. In this video I settled for Huxwrx 5.56Ti Flow Can.