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Posted: 3/25/2026 5:36:38 PM EDT
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I've watched some videos, but didn't see anything to get my notches aligned on the bullet drop compensator knob. I know you bottom out the knob, then click it forward to the "Z" setting to zero at 25m for a 25/300 yard zero. If my notches don't align, will this affect my zeroing process? If anyone can help me move forward on this, that would be greatly appreciated! I have attached some pics. I think the Z setting is aligned, but it's not perfect. Attached File Notice my notches don't align on the 6/3 setting, and this is fully bottomed out. I can't turn it down far enough to expose the set screw on top to loosen. Attached File It's a new to me Windham Weaponry M4A4 government model. Attached File |
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Here's what Brave AI says: To zero a 6/3 detachable carry handle AR-15 for a standard 36-yard/300-meter zero, set the rear sight to 6/3, adjust the elevation to make the sights bottom out at 6/3 minus 2 clicks (or the "Z" mark for 25-meter zeroing on rifles), and fire a group at 36 yards (or 25 meters) to align the point of impact with the point of aim. |
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Originally Posted By mcantu: You'll need to loosen the 1/16 hex screw on top to realign the wheel. Set the top part of the wheel to 6/3 and rotate the bottom half so you have 2 counterclockwise clicks of room from being bottomed out ^^ This ^^ Most importantly, make sure you use the M16A2 zeroing target. Attached File |
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I was able to loosen the 1/16" set screw. I bottomed the lower knob down to the last click and aligned the 6/3 knob notch with the carry handle notch and retightened the set screw. Rotating from 6/3 setting to Z to zero the rifle is raising the sight, so what would the purpose be of leaving 2 clicks from bottoming out? Trying to understand. |
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| I have it set that when the knob is fully bottomed out, it is perfectly lined up with the 6/3 setting. Raising the knob 2 clicks puts it perfectly on the Z setting now. |
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Originally Posted By cubie: I was able to loosen the 1/16" set screw. I bottomed the lower knob down to the last click and aligned the 6/3 knob notch with the carry handle notch and retightened the set screw. Rotating from 6/3 setting to Z to zero the rifle is raising the sight, so what would the purpose be of leaving 2 clicks from bottoming out? Trying to understand. It's to make sure you get a full click at the bottom. The USMC set their carry handles to have 3 extra clicks (fixed carry handle) or 6 extra clicks (removable) so they could dial down to 100 and 200 with the small aperture |
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Originally Posted By mcantu: It's to make sure you get a full click at the bottom. The USMC set their carry handles to have 3 extra clicks (fixed carry handle) or 6 extra clicks (removable) so they could dial down to 100 and 200 with the small aperture |
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Originally Posted By MudEagle: ^^ This ^^ Most importantly, make sure you use the M16A2 zeroing target. https://www.ar15.com/media/mediaFiles/470117/M16A1-M16A2-Black-32100-1-3703417733_jpg-3736078.JPG |
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Originally Posted By cubie: Thanks for this! Originally Posted By cubie: Originally Posted By MudEagle: ^^ This ^^ Most importantly, make sure you use the M16A2 zeroing target. https://www.ar15.com/media/mediaFiles/470117/M16A1-M16A2-Black-32100-1-3703417733_jpg-3736078.JPG I believe this is only for M855 when using 20" barrel. |
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Originally Posted By Raidersgone: I believe this is only for M855 when using 20" barrel. |
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RIBZ Method Read this explanation. In my opinion, this is the best way to set up an A2 rear sight. Works for detachable carry handles as well. |
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Originally Posted By Spatten: RIBZ Method Read this explanation. In my opinion, this is the best way to set up an A2 rear sight. Works for detachable carry handles as well. |
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Originally Posted By Spatten: RIBZ Method Read this explanation. In my opinion, this is the best way to set up an A2 rear sight. Works for detachable carry handles as well. RIBZ is just the USMC setup with a couple of extra clicks |
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Yes I remember we had ours bottom out to clicks past 6/3. It wasn’t to use but rather just have it where the aperture is not bottoming out and has a wiggle room to maintain zero. It was unauthorized to eff with the site at all so the rule was if it didn’t bottom out with 2 clicks past 6/3 that it had to go to the armory. For 20 inch you zero on the Z then dial it back to 6/3. For 14.5 you only have to zero on 6/3 not the Z. After that there was no touching. We never learned that ribz thing. |
| Well, I adjusted the knob to have 4 clicks past 6/3. Does anyone one know what the MOA value per click is? Would tightening my knob 2 clicks past 6/3 put me at a 200 zero? 4 clicks past 6/3 at 100, etc? I guess I'll only know when I get out and shoot the damn thing. Would be nice to know if each click is 1/4, 1/2, or 1 MOA. |
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Originally Posted By dalle0001: Yes I remember we had ours bottom out to clicks past 6/3. It wasn’t to use but rather just have it where the aperture is not bottoming out and has a wiggle room to maintain zero. It was unauthorized to eff with the site at all so the rule was if it didn’t bottom out with 2 clicks past 6/3 that it had to go to the armory. For 20 inch you zero on the Z then dial it back to 6/3. For 14.5 you only have to zero on 6/3 not the Z. After that there was no touching. We never learned that ribz thing. I bought a surplus handle, and it was set to bottom out one click past 6/3 |
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Originally Posted By cubie: Well, I adjusted the knob to have 4 clicks past 6/3. Does anyone one know what the MOA value per click is? Would tightening my knob 2 clicks past 6/3 put me at a 200 zero? 4 clicks past 6/3 at 100, etc? I guess I'll only know when I get out and shoot the damn thing. Would be nice to know if each click is 1/4, 1/2, or 1 MOA. |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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Originally Posted By cubie: Well, I adjusted the knob to have 4 clicks past 6/3. Does anyone one know what the MOA value per click is? Would tightening my knob 2 clicks past 6/3 put me at a 200 zero? 4 clicks past 6/3 at 100, etc? I guess I'll only know when I get out and shoot the damn thing. Would be nice to know if each click is 1/4, 1/2, or 1 MOA. 4 clicks counterclockwise from 6/3 will put you at 200. You could also flip to the large aperture but lose the finer aiming of the small one |
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Originally Posted By mcantu: 4 clicks counterclockwise from 6/3 will put you at 200. You could also flip to the large aperture but lose the finer aiming of the small one |
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Originally Posted By mcantu: You'll probably be about 2" high at 50 |
Life is like a box of chocolates, you never know what you're gonna get!
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Originally Posted By Spatten: RIBZ Method Read this explanation. In my opinion, this is the best way to set up an A2 rear sight. Works for detachable carry handles as well. |
What it boils down to is that they fear an effective resistance to their power: So, Left in power=Guns bad, mmmmkay...?, Right in power=Guns good!-thskirk
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Originally Posted By cubie: Well, I adjusted the knob to have 4 clicks past 6/3. Does anyone one know what the MOA value per click is? Would tightening my knob 2 clicks past 6/3 put me at a 200 zero? 4 clicks past 6/3 at 100, etc? I guess I'll only know when I get out and shoot the damn thing. Would be nice to know if each click is 1/4, 1/2, or 1 MOA. Attached File |
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Originally Posted By 03RN: https://www.ar15.com/media/mediaFiles/433221/Sight-Adjustment-Chart_jpg-3736820.JPG |
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Originally Posted By 03RN: https://www.ar15.com/media/mediaFiles/433221/Sight-Adjustment-Chart_jpg-3736820.JPG The upper-right table. How is the M4's windage the same, but not the elevation? |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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Originally Posted By MudEagle: ^^ This ^^ Most importantly, make sure you use the M16A2 zeroing target. https://www.ar15.com/media/mediaFiles/470117/M16A1-M16A2-Black-32100-1-3703417733_jpg-3736078.JPG Yes it is important to realize if you can group 3-5 shots into that center circle there’s a good chance it’s zeroed out to 300. Not 100% but definitely an 80-90% confidence level especially during a deployment where they only have a 25m range. |
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Well, I think I finally got it dialed in. I zeroed at 27 yards on the Z setting. Turned it 4 clicks counterclockwise past the 6/3 setting and this is the group I got at 50 yards. The rifle is grouping well! Setup in a Lead Sled for zeroing. 55gr Federal xm193. Attached File |
Life is like a box of chocolates, you never know what you're gonna get!
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Attached File |
Life is like a box of chocolates, you never know what you're gonna get!
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Originally Posted By cubie: Well, I think I finally got it dialed in. I zeroed at 27 yards on the Z setting. Turned it 4 clicks counterclockwise past the 6/3 setting and this is the group I got at 50 yards. The rifle is grouping well! Setup in a Lead Sled for zeroing. 55gr Federal xm193. https://www.ar15.com/media/mediaFiles/524411/IMG_1682_jpeg-3750952.JPG 
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Originally Posted By mcantu: dang, did I call it or what when I said you'd be about 2" high at 50? |
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Originally Posted By mcantu: just following up. did you get it out to 100/200? Attached File |
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After shooting that group, I adjusted my windage one click to the right and shot another group. Attached File I love this rifle! Dropping an MBT trigger into it made it much better. Attached File |
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Originally Posted By AS556: OST. I just zero at 50 yards like I would with any AR and never touch the wheel. Am I missing something by doing this? 20” BCM A4 type upper with 855. Love the 50 yard zero, I use it for all my iron sights. To preserve the markings on the elevation wheel if you are using A2 rear sights, then you set it to bottom out 2 clicks below 8/3... "So the sight should be at 8/3 -2 clicks, all the way down, not up a click. Please note that removable carry handle sights are marked 6/3 (rather than 8/3); also some are in 'half-clicks' as well. There should be 3 clicks between 3 and 4 on the knob. If there are 6 clicks then the sight needs to be set at -4 clicks (instead of -2)." And that's that, zero with the small small aperture as normal. |
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