6.8 Spc AR with a Acog site

roswellnative

February 05, 2012 18:26

I tried to site in an ar this w/e. I was at 25 yd and just trying to get on the paper. Long story short is that the sight maxed out on elevation and I was still about 6-7 in low> I have installed the sight on the rail and there is no carrying handle>

RN

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  roswellnative

  February 05, 2012 18:48

  I guess my question is that for a goal of 1.5 in high at 100 yd.
  
  Where should the poi be at 25 yd?

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  charliemeyer007

  February 05, 2012 19:35

  I played with the ballistics calculator at Hornady http://www.hornady.com/ballistics-resource/ballistics-calculator
  
  and just as I remembered (most guns) at 25 yard cuts the paper the same place at 200. In your case that would be 2.5 inches high at 100 for their 110 hp. You may need to shim the front of the rail or get one with evelation built in.

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  tsr1965

  February 06, 2012 01:40

  quote:Originally posted by charliemeyer007
  I played with the ballistics calculator at Hornady http://www.hornady.com/ballistics-resource/ballistics-calculator
  
  and just as I remembered (most guns) at 25 yard cuts the paper the same place at 200. In your case that would be 2.5 inches high at 100 for their 110 hp. You may need to shim the front of the rail or get one with evelation built in.
  
  
  The sight is installed on a flattop. The rail is an integral part of the upper reciever casting. There is no "shim under the rail" here, and the "shim" goes under the rear of the rail, not the front, if it were able to have a shim.
  
  roswellnative,
  
  Which ACOG site do you have? Is it an actual Trijicon, or a knockoff? If I am not mistaken, with some of the Trijicon models, there is a base/elevation adjustment for coarse elevation, and the turret is for the finer adjustment.
  
  Is this upper a factory built upper, or a parts gun? Could it be possible that the threads in the upper for the barrel are off?
  
  Also, considering your sight height above the centerline of the bore, it might be a bit much to ask for that much adjustment, but at 6-7 inches low, I am thinking that the barrel is canted.
  
  Best

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  armilite

  February 06, 2012 15:30

  There is got to be something else at play here maybe not a real ACOG. I had no problem sighting mine in at 25yds.
  
  
  
  [img][/img]

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  Riomouse911

  February 08, 2012 14:28

  We had the same issues sighting in M-4's, we found that at 25 yards every shot was a bit low. I moved to 100, did them 2" high, and we're darn close to center at 30 and again at about 200.

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