I've no idea of the all of the primers that I've used in the M1A I have, but there have been no slam fires to date.
Still, during this round of "stock up", I've gone to the CCI mil types for both the AR and M1A.
I figure that the cost differential, per shot, is minimal, and, for the price, safety makes sense.
But I agree with primer standardization for logistics: WSP and WLP for pistols, CCI for rifles.
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