Never occurred to you that they use the magazines due to NATO standardization,, and the AUG uses its own, curved mags..
Also, there wouldnt be a SCAR or ACR if the AR15 didnt have glaring flaws in need of correction.. Notice zero of the rifles you mentioned adopted the flaws I mentioned? They all have internal rails for the carrier to ride on, none of them are direct impinged, and no buffer tubes either... I wonder why theyd eliminate all of these features if they werent inherent flaws?
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