It is for the record, that these Islamic terrorists used AK-74’s as their weapons of choice...
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No they didn’t.
the pictures I saw, were NOT ar-15’s, or any design derivative of that genre.
It has been proven, on another occasion, that, yes, the spent casings on the ground matched ak-74 rounds, when compared to .223, 5.56mm, and the ak47’s 7.62x39mm casings. The ak-74’s use a similar chambering to 5.56mm with a short casing.