"CAR-15" (Colt Automatic Rifle) is just the brand name for the Colt-made AR-15. The ArmaLite AR-15 article exclusively covers the ArmaLite AR-15, not the Colt model. The original ArmaLite AR-15 was never adopted by the US Army.
We're working on restructuring the AR-15 articles but for the time being, ArmaLite AR-15 refers exclusively to the pre-production models that were made at ArmaLite.
I now checked about the CAR thing, and it seems to be correct, but it needs to be clarified in the intro of the article, considering that the "CAR-15" designation today is mainly used for the carbine versions produced after the M16.
On another note, I never said that the original ArmaLite model was adopted, neither that the company made M16s. I was just saying that the Colt M16 was based on it.
I understand your position, at the moment I'm finding it difficult to organize information between these articles because the structure is a big mess. I don't know why the M16 is a separate page to the AR-15, this problem could be easily avoided by merging the two pages. I'll rewrite the intro so that it is a little more clear.
I think having every AR-15 variant bundled into one page was a bad idea, so I can understand the split, but I don't think there should be seperate articles for the CAR-15, M16, and ArmaLite AR-15, given that essentially they're all directly connected. Certainly I don't see the point of a seperate M16 article, since the M16 isn't a gun in and of itself, but rather just the US military designation for the AR-15. I think an article merge should be considered here.