Posted: 2/28/2011 2:30:29 PM EDT
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Wondering what the Magpul guys recommend for a co-witness. It appears from the videos that they advocate an absolute co-witness, and it seems like the easiest way to sight in a rifle since you just need to sight the irons, then put the dot on your front sight post. It seems however that a lot of people prefer a lower 1/3 co-witness. Planning on getting a T-1/H-1 in a Larue QD mount and want to only buy once (and cry once). My carbine has a fixed M4 front sight.
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I personally bought a co-witness mount from Larue and don't even notice the front sight when shooting. Might be because I'm left eye dominant though.
My thought process was that if I had co-witness, I wouldn't have to adjust my cheek weld when/if I have to switch to my back up sights. But what do I know. My issued weapon is the SAW. |
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Quoted: I personally bought a co-witness mount from Larue and don't even notice the front sight when shooting. Which mount? There is a large difference between absolute and lower 1/3 cowitness. Using fixed BUISs or folders in the up position, I hardly notice the sights through the Aimpoint using a lower 1/3 cowitness, but they are very much in the way using an absolute cowitness. Lower 1/3 cowitness on the left, absolute cowitness on the right:   I set the front of my camera lense where your eye would be looking through the Aimpoint, so these images are very close what you would actually see. You have very little room to see the dot on an unobstructed target using the absolute cowitness. |
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Quoted: Quoted: I personally bought a co-witness mount from Larue and don't even notice the front sight when shooting. Which mount? There is a large difference between absolute and lower 1/3 cowitness. Using fixed BUISs or folders in the up position, I hardly notice the sights through the Aimpoint using a lower 1/3 cowitness, but they are very much in the way using an absolute cowitness. Lower 1/3 cowitness on the left, absolute cowitness on the right: http://img.photobucket.com/albums/v509/topgunpilot20/cowitness_lower.jpg http://img.photobucket.com/albums/v509/topgunpilot20/cowitness_absolute.jpg I set the front of my camera lense where your eye would be looking through the Aimpoint, so these images are very close what you would actually see. You have very little room to see the dot on an unobstructed target using the absolute cowitness. Thats an excellent illustration, thank you, the sight picture is much better with the lower 1/3 than the absolute. |
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Quoted:
Quoted:
I personally bought a co-witness mount from Larue and don't even notice the front sight when shooting. Which mount? There is a large difference between absolute and lower 1/3 cowitness. Using fixed BUISs or folders in the up position, I hardly notice the sights through the Aimpoint using a lower 1/3 cowitness, but they are very much in the way using an absolute cowitness. Lower 1/3 cowitness on the left, absolute cowitness on the right: http://img.photobucket.com/albums/v509/topgunpilot20/cowitness_lower.jpg http://img.photobucket.com/albums/v509/topgunpilot20/cowitness_absolute.jpg I set the front of my camera lense where your eye would be looking through the Aimpoint, so these images are very close what you would actually see. You have very little room to see the dot on an unobstructed target using the absolute cowitness. I'm using the LT751 absolute cowitness with a front sight post. Before I go any further, let me just say I haven't been to any classes and this is just my opinion (not saying anyone is right or wrong). When I shoot with my micro I focus on my target. The front sight becomes a ghost. I could see where someone may not like that though. But for me, I get to keep the same position on the stock whether I'm using the RDS or my BUIS. I feel your pictures are a bit misleading. What you see in those pictures is what your one eye would see. With RDS you shoot with both eyes open, giving you a different sight picture. But as far as the height of the post, I think that gives you a good idea. |
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Yeah if you're going to be looking through the optic at a different angle than you would your irons, then moving it to a lower 1/3 or whatever you're comfortable with makes sense.
Personally once the reticle is on I don't even see the fixed fsb even though I have an absolute co-witness. With both eyes open I see the reticle on top of what ever is in front of me. There's no focus or blur from the front sight. It's almost as if there's a big red reticle right in front of me as if I wasn't looking through the sights at all. It's bad enough doing the math as to bullet rise and drop with a co-witness, let alone having to do more maths to account for an added variable of moving the reticle around. If you close your other eye yeah I guess you might have trouble seeing around the fsb. But if you use the sights as intended and you don't have some transverse cut in your brain severing the two halves, I don't see how it would be a problem 
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Non expert opinion:
For me, the whole POINT of the red dot was to give me a clear, wide, unobstructed sight picture for fast target AQ. My lower 1/3 co-witness is perfect, and does not clutter up the sight picture. An absolute co-witness is not my preference, I don't really know if there is a "best" way for this, its mostly personal preference, imho. |
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Besides what others have said, a few observations:
Most of the pictures I've seen show the magpul guys running with a T1 in a high LT mount. That would be lower 1/3. I prefer lower 1/3... Not like you should care though 
Knights is working on a higher than lower 1/3 T1 mount. Kind of an interesting concept, check it out over in their forum. |
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Quoted:
Non expert opinion: For me, the whole POINT of the red dot was to give me a clear, wide, unobstructed sight picture for fast target AQ. My lower 1/3 co-witness is perfect, and does not clutter up the sight picture. An absolute co-witness is not my preference, I don't really know if there is a "best" way for this, its mostly personal preference, imho. I agree, its all personal preference. |
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Quoted: Quoted: Non expert opinion: For me, the whole POINT of the red dot was to give me a clear, wide, unobstructed sight picture for fast target AQ. My lower 1/3 co-witness is perfect, and does not clutter up the sight picture. An absolute co-witness is not my preference, I don't really know if there is a "best" way for this, its mostly personal preference, imho. I agree, its all personal preference.  Colt factory installed F FSB in front, and a LMT BUIS in back 
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