So i have never had a reliability problem or anything with my stag arms ar15 just curious as of why when i shoot it it trails like a tracer? I shot a three gun last year and was questioned about it you cant see it through the scope but when to the side you see a "smoke" trail. Tried differwnt powders primers bullets all do it. I never never noticed it until i switched out gas blocks for a low profile so was curious if it was like overgassed or something?