Actually the CCI 400 is a popular primer for the AR. It is one of the recommend primers along with other such as the Remington 7 1/2, CCI BR 4 and Federal 205 M.
What is not recommended is the newer Winchester brass colored primers. These are extremely soft and do in fact run the risk of being pierced by the firing pin.
In the end it is your choice and your gun. I would stick to the above primers even if some one else has a 40 years history of not doing so. I personally use the Remington 7 1/2 for my AR rifles.
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