Quoted: Im Still kinda cofused once again about my zero?
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Because you're trying to use the A1 sight zeroing method with an A2 aperture - the two are nowheres near the same.
Should I zero with wich Ap.?
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The one you intend on using. I find using the small aperture to 'get close', then switching to the larger one to finish it up.
My M4's ARMS#40 has a 8moa difference between the apertures (we just tested it saturday).
If you were to zero it at 25y with the small aperture, you would have a 390y far zero (with M193) and the large aperture would never cross the point of aim, and the bullet would stay between -1.5 to -2.6" till 150y or so. At CQB distances you'd have a consistant 2" offset. Interesting, but not useful to me IMHO.
Zeroing at 50 with the large aperture (for that nice flat IBSZ trajectory), produces a decent 20y/470y "long range" trajectory with the small aperture. To me this is more useful, but you should note the trajectory reaces a height of 18.75" at 270y or so.