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Posted: 3/14/2009 3:01:54 PM EDT
| I just added a EOTech 512 to my DPMS 16 Lite. This particular model has a no detachable handle, so gun store attached it on top of the handle with a mount adapter. I took it to sight it in and at 25 yards it shot about 2-3 inches high with a grouping of 4. I then went to the 50 yard range and never hit the target once........with about 30 rounds!!!! I could nail it with the iron sights, but never could hit it with ALL kinds of different windage and elevation adjustments. I have probably turn everything too much now. I had no clue where it was shooting. I even put another 15 inch target below and shot at both, thinking if it was high or low I would be able to tell. WHAT'S UP???? |
| I tightened it again before I shot the 50'. The target was at least 30" up and down and I put some other targets left overs on each side, which made it about 25" across. .It really must be way off. I know the sight is way high because of being attached to the handle, but I thought I adjusted for it. Maybe it's too big of an adjustment. Can you not put a EOtech that high above? The gun store said yes! |
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If the EOTech is mounted on top of the CH and your hitting high at 25 yds your rounds are still climbing to its highest trajectory before dropping back to line of sight. Get your EOTech to be point of aim/point of impact at 25 yd. Then move back to 50 yds and remember you'll still be high as the round is climbing. If with all the adjustments you can't find where its hitting then set up a 3' by 3' clean target at 10 yds and fire, adjust, move back another 5 yds and repeat until satisfied. I had to do this with C-More sites on top of M4 as the factory setting was way low. Hope this helps.
CD |
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I was sighting in an eotech on my RRA last week. It was shooting high and to get it on the target I had to turn the screw close to two full revolutions. Once I did this I dialed it in with a couple clicks vertical and a couple horizontal.
I should have used a bore sight to get started... but as we all know, hindsight is 20-20. |
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Quoted:
I just added a EOTech 512 to my DPMS 16 Lite. This particular model has a no detachable handle, so gun store attached it on top of the handle with a mount adapter. I took it to sight it in and at 25 yards it shot about 2-3 inches high with a grouping of 4. I then went to the 50 yard range and never hit the target once........with about 30 rounds!!!! I could nail it with the iron sights, but never could hit it with ALL kinds of different windage and elevation adjustments. I have probably turn everything too much now. I had no clue where it was shooting. I even put another 15 inch target below and shot at both, thinking if it was high or low I would be able to tell. WHAT'S UP???? If your EO Tech is mounted on top of your carry handle, then you can not just zero it at 25 yards and expect all to be well. This is because your sightline (looking through the EO Tech is almost double the distance from the bore as your 'normal' sightline (looking through your irons/ absolute cowitness). Having your EO Tech zero at 25 yards means that you will be arcing the bullet higher that normal, which will give it a steep ballistic curve, staying an unamagable distance from your sightline until it crosses again on its way down, 250-350 yards later. You could very well be 2 or 3 FEET high at 50 yards. If you have a method of locking down your rifle, so so, then compare your view through your optic to your view through your irons. I would reccomend a 100 yard zero with your EO Tech where it is. I would actually recommend a gooseneck mount for it to allieviate this problem. |
| I like that last idea. That makes the most since to find out where the Eotech is aiming. Do I sight it in first with the iron sight and then look at the target through the EoTech or vice versa? Once I get the 50 yard done I still have to get it right at 100 yards. |
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No matter what you do, you are going to have to be able to FIND your rounds. If you are so off now that you miss the target, you will never know just how far you are off. My suggestion is:
1. Zero your rifle (at your preferred distance) using your iron sights. This is to make sure that you know you are on track. 2. Begin to zero your rifle at 25 yards. This beginning process is to make sure your windage in lined up, and that your elevation is not completely out of control. If done correctly, your grouping should be centered and about 2" lower than your point of aim with your EO Tech. 3. Move out to 50 yards. Using the EO Tech, continue your zero process. Your rounds should be centered (left/right), but should still be about 1" lower than point of aim. 4. Move out to 100 yards. Complete zero with your Eo Tech. Your goal now should be to center your rounds with your EO Tech aiming point. With this method, you need to be aware that close in, where you aim your EO Tech is not where your rounds will hit. This method is what I consider best for your mounting solution, as your ballistic path and your line of site will constantly converge within the EO Techs normal engagement zone. This style of mount takes a lot of practice to get used to. Once zeroed at 100 yds, go back to various ranges (50 yds, 25 yds, 7 yrds) and look to see how far your sight and bullet paths are. The top of charging handle postion was meant for scopes, not CQB optics, which is what the EO Tech really is. I still really reccomend a gooseneck mount, as this will bring you back into a lower 1/3 co witness, which is much more effective for a reflex sight. |
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I'd also recommend a gooseneck. This gets the Eotech back where it needs to be, and give you co-witness to boot.
In the meantime, zero it at 25 yards with a 5" hold-over - that is, put 2 aiming points on your target, one 5" over the other. Aim at the top one with the Eotech, and zero it so the bullets are hitting the lower one. This will help with the offset, and should keep you on the paper as you go out to 50 yards and re-zero, then 100 yards and re-zero. |
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