At 100 meters each click will move your point-of-impact ≅ 1″. A bore sight has it's place. Yet so many people don’t go that far. For the carry handle sight, that means using the “Z” notch on a 20″ rifle (or one click below if using M855). The longer that distance the smaller the point of impact moves for each click of elevation or windage. So glad you posted the armorer’s mod, too. On a 14.5″ barrel carbine with a removable carry handle, when the sights are dialed down 4 clicks below the “6/3” (“6/3-4”) then the sights are calibrated for a 46 yard/200 meter zero. With the 14.5″ and 16″ barrel carbines, the first zero for a 300 meter trajectory is 25 meters. Any of these elements can affect the rifle’s zero. On that setting it should hit where you aim at 25 meters and 300 meters. Using M855, 62-grain ammo, select the elevation dial TWO clicks clockwise UP past the “6/3” mark on the drum to the “Z” setting (see photo to the right). The chances of missing the paper completely are smaller since it’s so much closer. The wearing of full battle gear changes eye relief, placement of the rifle in the shoulder pocket, and the way the rifle is supported on the handguard. I have been careful to exclude the specific distance to zero the rifle as there are several different zeroing philosophies that will be discussed further down. This site uses Akismet to reduce spam. The Revised Improved Battlesight Zero (RIBZ) is an enhanced version of the Santos Improved Battle Sight Zero (IBZ). This site uses Akismet to reduce spam. Once you have the iron sights, optic, and the spacer/riser if necessary you’ll move to zeroing your iron sights. For your trouble I’d be glad to link to your blog or website further down on this sidebar. Only fixed carry handle rifles have 8/3 markings. The AR-15 rifle has two adjustable sights- front and rear. With M193, 55-grain ammo: zero at 30 yards). The “Z” setting lets you still use a 25 meter range and targets and properly zero your 20″ barrel and removable carry handle combo. I hope that it helps you out. The same problem will happen with the “5”, “6”, “7”, and “8”, but the farther away, the more the problem will get exasperated. Remember that bullets do not fly in a straight line. It’s elevation aims 2.5 MOA (roughly 2.5″ at 100 yards) below the normal range aperture. At 200 yards the bullet will impact ≅ 4.33″ above point-of-aim. Probably 25 meters with the lower of the 6/3 settings. Most Army and Marine veterans aren’t aware that the different branches of service set up their sights differently on the same type of rifle. Flipping the sight back to the "L" marked aperture will automatically extend the zero to 375 meters without additional adjustments to the front sight post. The 46, 48, and 50 yard first zero references are presented only for technical enlightenment of the reader. 2: aim at target center and adjust sights to bring shot groups as close as possible to center of circle. That means that the rear sight is not adjustable. One can not work with out the other to place a shot or shot group in the center of the target at any given distance. The A2 drum has one minute of angle (MOA) adjustments, while the 6/3 has half MOA. I’m glad that it helped. Whether or not I prefer this method, the fact remains that the US Army has put a lot of bad guys into the dirt using this method. When it comes to average pistol shooting, your best bet is to adjust the sites to match your point of aim/point of impact at 7-10 yards and then learn how to hold higher or lower as needed. Current Army/Marine Corps battle sight zero and it’s procedures are well described in TM9-1005-319-10, the M16/M4 operator’s manual. Forgive me but my A-1 sights are not marked "L" it says "A-1" instead with that one being the taller sight, so I am assuming that this is the "L" sight despite it not being marked that way. For each one, I’ve listed its adjustment amount for both elevation and windage. Christmas, kids, work, etc. It means that you have to make the line of aim that comes out of the iron sight and bullets course together, making them one path. Their logic is that it will be easier for you to see your target with the larger aperture with less light, but more precise shooting is possible with the smaller aperture during daylight. The lowest sight setting, however, on these sights is 300 meters so the sight needs to be modified to preserve the markings on the sight (despite the fact that no one ever sets a range on these in the real world other than a USMC range). Both involve modifying the rear sight so that sight settings can be selected two clicks below the “8/3” or four clicks below the “6/3” settings . Before choosing an iron sight for your AR-15, you should consider several factors such as material, aperture type, ease of use, visibility, design (flip up or fixed), mounting options and type (gas block or same plane). If your adjustments are in half MOA increments, then four clicks moves your point of impact 16 inches at 400 yards. Gain insights from pros, new content notifications, vendor discount alerts, and more! There are times where I link to specific products or companies that I recommend. If you have to shoot targets you KNOW are 300 meters away or more, just click to the right number on the sight. Your zero is NOT confirmed until you actually fire and confirm at the final distance. There are rings on the inside set at 6, 8, and 12 MOA. When the different trajectories are compared against each other, there is only a few 100 of an inch difference between the three of them at 50 yards. All AR platforms have the same Picatinny rail, so that’s an added benefit for easy mounting. Some people will claim that meters and yards are so similar that it doesn’t matter. If you want to be zeroed for 200 meters, then you need to put your target out at 200 yards and finalize your zero. You need to find one Battle Sight Zero that will do it all. Even if it’s on the edge of the paper, it’s still on the paper. This larger aperture is only used when the rear sight is down and aligned with the “6/3” or “8/3” indication on the rear sight’s range elevation selector. Assume the same +/- 7″ performance with either length. “Marine Corps” rifles will have sights that can be lowered two more clicks below the 300 meter setting. Set the drum to “4” when shooting at 400 meters, “5” when shooting at 500 meters, and the higher 6/3 setting when shooting at 600 meters. With M193, 55-grain ammo: zero at 27 meters (29.5 yards). I totally understand why they do it this way. When the rifle is zeroed so that point-of-aim = point-of-impact at 300 yards with the “3” setting, none of the other settings will be calibrated. The sight needs to be set to bottom out at 8/3 -2 clicks. Semper fidelis. Once you zero your iron sights and you have confirmed and are comfortable with their zero you can mount your optic. Just zero it perfectly at 25 meters with the lower 6/3 setting. It is very important to appropriately set your range to target. I can then put it on the “3” or “4” setting and hit steel targets at 300 and 400 yards. Set the sights for the lower 6/3 and zero at 33 yards with M855 (30 yards with M193). There are four clicks per turn on an A2 post, so one click is 1/144″ of movement, which equals 0.00694″.
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