Hi Friends, I am new to the AR-15 world, bought a Rock River Arms NM4 for competition. Took it out to the range to try it out and it sure flings brass quite a ways. Bought a Brass Deflector and it's on it's way. Just wondering if there any negatives about using a brass deflector on an AR-15 that I should know about. Thanks in advance. Wanna kill these ads? We can help!