How to Zero an AR-15 at 50 Yards
Woody's answers are based on published federal and state law. Not legal advice. Consult a licensed attorney for your specific situation.
Set up at 50 yards, fire a 3-shot group, measure deviation from point of aim, then adjust windage and elevation turrets accordingly. Most red dots and scopes require 1/4 MOA clicks.
How This Affects Your Build
A 50-yard zero provides excellent practical accuracy for most AR-15 applications while being accessible at shorter ranges. This distance allows you to establish a solid baseline zero that translates well to longer distances. Most shooters find 50 yards easier to work with than 100 yards when initially setting up optics or iron sights.
The Detail
Start with a stable shooting position using a benchrest, sandbags, or bipod to eliminate human error from your zero process. Fire a careful 3-shot group aiming at the same point of impact, typically the center of your target. Measure the distance between your group center and your intended point of aim both horizontally and vertically.
Most modern optics use 1/4 MOA adjustments, meaning each click moves your point of impact approximately 0.25 inches at 100 yards, or roughly 0.125 inches at 50 yards. Calculate the number of clicks needed by dividing your measured deviation by your scope's click value. If your group is 1 inch low and 0.5 inches right, you would need 16 clicks up and 8 clicks left with a 1/4 MOA scope.
Make your adjustments and fire another 3-shot group to verify the correction. Fine-tune as needed with additional small adjustments. A 50-yard zero typically puts you close to a 200-yard zero depending on your specific ammunition and barrel length, creating a useful battlesight zero for general purposes.
Record your final settings and the specific ammunition used for this zero. Environmental factors like temperature and humidity can affect your zero, so document the conditions when you achieved your best groups.
Build Impact
Your barrel length and twist rate will influence how your specific ammunition performs at 50 yards, affecting group size and consistency. A quality trigger and stable stock setup become crucial for achieving repeatable accuracy during the zeroing process.