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I've been emailed by a couple that said they have seen early 65 and 66 with m16 fire control parts , anyone else? I guess the rifle is a 1965 and I was wrong on 1966.
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checked my SP1s serial 4xxx and below. they all have the full auto trigger and disconnector. my later SP1s (5xxx up to 200xxx) went to the half disconnector.
all my hammers had the circle and the early ones marked with the E in a C but seeing as how everything else is looking right, it's within the realm of possibility it's original and untouched.
there were a lot of changes in the first 1000 like dimpled pivot pins, transitional bolt catches. other early features carried on for a little longer like dimpled selectors, + on the lower, carbon steel and stainless steel early bend gas tubes, no drainhole handguards, thin pistol grips etc...