if anyone can help with documented ballistics differences in the .223 caliber comparing those published ballistics from a 16" bbl to a 10.5" or 8" bbl. I am considering a SBR for duty use, to carry on my motorcycle. I'm currently rifle qualified in the department, but I can only carry my rifle when I am in a car. Several guys have gone to 10.5" bbl, but it is still a tight fit on my bike. the extra couple inches should make the difference in fit, but at what cost in ballistics?