.223, 5.56, 7.62, .308, 30-06 and a 12 gauge slug are all capable of causing rotor damage with a proper impact point. several impacts will cause malfunction. all of the above plus. 45 acp will defeat the both upper and lower windshields with ease inside their effective lethal ranges. buckshot will cause cracking and obscure vision assuming you can land a hit.
United States