by Carol on 9/18/2012 I just shot 200 rounds by my M4 without a hitch. No jams, extraction problems, or are unsuccessful to fireplace. Pulled out the bolt, and other than a haze on it, it wasent dirty whatsoever. Very same haze Within the flash hider, but ran my finger there, as well as the smudge didnt even transfer to my skin.Inexperienced Idea f