View Full Version : AR-15 Sight In Help
March 6, 2010, 08:43 AM
I want to sight in my AR today at 25 yards like I think I'm supposed to. I did this last time but when I went to shoot at 50 yards I was way high. Do I need to account for the distance between the sights and the barrel since the front sight is at least 1'' above the barrel.
March 6, 2010, 09:05 AM
The impact should be at least 1" below point of aim at 25 yards with the short range peep. If you intend to shoot at 100 yards only, you can use the longrange aperature and adjust accordingly.
March 6, 2010, 09:34 AM
If you zero at 25 yards with a high sight (open or scope) the line of your sight and the bore sight will cross at quite an angle that close to the muzzle. You're looking down, the muzzle points up, meaning you're way high at longer ranges. I usually sight an inch high at 25 to get on paper at 100.
March 6, 2010, 09:54 AM
If you zero at 50 yards, you'll be within 2" of point of aim out to 200yds. Just something to consider.
March 6, 2010, 10:13 AM
I want to sight in my AR today at 25 yards like I think I'm supposed to. That's a 300m zero and it's actually 25m at the close range, not 25y. It's a terrible zero. Even if you get it set right (hard to do at such a close range zero because the margin of error is so critical), you're like 1.5" high at 50y, 4" high at 100y and 5" high at 200y.
If you zero at 50 yards, you'll be within 2" of point of aim out to 200yds. Just something to consider. This is the zero I use on all my AR15s. It's much more useful than the military way. It's actually a 200m zero (218y) and +/- 2" out to 250m.
If you have a fixed elevation rear flip sight (A1 or BUIS), then just zero at 50y with the small (long range) peep. Verify about 1.6" high at 100y. When you flip to the close range peep you are within an inch or two of a 100y zero (you can try different apertures, some vary in the elevation heights (http://www.xssights.com/faqs.html#faq4)). Perfect zero for carbines.
If you have an elevation adjustable sight (A2 carry handle), you need to calibrate it like this:
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