Brazilian airsoft retailer, Beartac, give their take on the Specna Arms SA-C03 AEG Core C-Series. Specna Arms are making big in roads in the Brazilian airsoft market as we see retailers in the country making reviews of their products. The Specna Arms SA-C03 AEG Core C-Series is 2-tone M4 AEG that has an initial muzzle velocity of 380fps.