I've been reading up on those trajectory charts listed on this thread supplied by Nitesite: http://www.m4carbine.net/showthread.php?t=65679 Now I zeroed my A4 rear sight to be in line with the RIBZ (Revised Improved Battlesight Zero). Due to the fact that my rear sight is stated at 6/3 I need my sight at -6 for 100 yards and -4 for the 50 yard/200 meter setting. My question is this: If I'm set up at -4 for the 50 yard/200 meter and based on the charts my far zero point of impact will be roughly at the 225 yard mark. If I'm shooting at a target 200 yards away my impact will be roughly in the 1" higher than where I am aiming. What if I set my rear sight at -5.... would that flatten out my trajectory of the bullet and hit better at 200 yards? Or would that have me hit about 1" lower than my point of aim. Just throwing it out there as a theory question right now. Haven't hit the range to test the results. Plus getting the 200 yard spot is tough to get.