Tips on Adjusting Red Dot Sights for Precise Targeting

Chris G.

Your speed and accuracy on the shooting range largely depend on the precision of your red dot sight adjustments. This optic, when tuned correctly, can significantly improve your accuracy, irrespective of your experience level.

In this article, I will discuss how to adjust the dot and why you should adjust it. I will also point out factors such as the relevance of Minute of Angle (MOA) in sight adjustment, selecting the right zeroing distance, and the steps to zero your sight effectively.

What is MOA, Windage, and Elevation

For those looking to improve their shooting precision, three critical components come into play: MOA, windage, and elevation. Understanding how these factors work is fundamental for effectively using a red dot sight. 

MOA (Minute of Angle): MOA is a unit of angular measurement commonly used in firearm optics. One MOA is equal to 1/60th of a degree, and it’s often used to express the angular measurement of a firearm’s accuracy or the adjustment value of sights. In practical terms, 1 MOA at 100 yards is approximately 1.047 inches. As you move farther from the target, 1 MOA represents a larger distance.

Windage: Windage refers to the horizontal adjustment of a sight. It allows users to compensate for the lateral movement of the bullet caused by wind. Windage adjustments on a red dot sight are typically measured in MOA. By turning the windage knob, you move the point of impact left or right to align it with the target.

Elevation: Elevation refers to the vertical adjustment of a sight. It allows users to compensate for the bullet’s drop over distance. Similar to windage, elevation adjustments on a red dot sight are typically measured in MOA. By turning the elevation knob, you move the point of impact up or down.

How They Factor in Red Dot Sight Accuracy

  1. Zeroing and Calibration: MOA adjustments play a crucial role in zeroing a red dot sight. When zeroing, you make windage and elevation adjustments to align the point of impact with the point of aim. Making precise and repeatable MOA adjustments is essential for achieving and maintaining accuracy.
  2. Compensating for Bullet Trajectory: As a bullet travels downrange, it is subjected to both drop and lateral movement due to natural factors such as gravity and wind. Windage and elevation adjustments allow users to compensate for these factors, ensuring that the point of impact remains on target.
  3. Adjustments for Different Ammunition: If you switch between different types of ammunition with varying ballistic characteristics, being able to make precise MOA adjustments is valuable. This allows you to maintain accuracy despite changes in bullet trajectory due to the bullet’s weight, power, shape, and other factors.
  4. Quick and Repeatable Adjustments: Red dot sights with reliable windage and elevation adjustments ensure that users can make quick and repeatable changes to the point of impact. This is especially important in dynamic shooting situations where rapid adjustments may be necessary.
  5. Sighting In: When initially sighting in a red dot sight, the MOA adjustments allow precise alignment. This guarantees that the red dot corresponds accurately with the point of impact.

How to Zero a Red Dot Sight

a person adjusting a red dot sight on a gun

Before using your red dot for your “real” shooting, you need to zero your red dot. Zeroing refers to aligning the point of aim with the point of impact. This ensures the bullet hits the target where the sight is aimed. 

Step 1: Set Up Your Firearm and Target

  1. Secure the Firearm: Ensure the firearm is unloaded and pointed in a safe direction. Remove the magazine, pull back the slide, and check the chamber to confirm it’s clear.
  2. Mount the Red Dot Sight: Securely mount the red dot sight on the firearm according to the manufacturer’s instructions. Use high-quality mounting hardware to ensure stability.
  3. Choose the Right Distance: Decide on the distance at which you want to zero the red dot sight. Common distances are 25, 50, or 100 yards, depending on your preference and shooting environment.
  4. Set Up the Target: Place a target at the chosen distance. Ensure it’s securely positioned and offers a clear aiming point.

Step 2: Bore Sighting 

  1. Bore Sight the Firearm: Bore sighting can help get your shots on paper quickly. Use a bore sighting tool or look through the bore axis to align it with the red dot’s projected point of impact. Make rough adjustments to get close to the target.

Step 3: Initial Shots

  1. Fire Initial Shots: At a close distance (10-15 yards), fire a few shots to get an initial grouping on the target. This helps establish a starting point for adjustments.
  2. Adjust Windage and Elevation: Use the red dot sight’s windage (horizontal) and elevation (vertical) adjustments to move the point of impact closer to the point of aim. Refer to the manufacturer’s instructions for the direction and value of adjustments (usually in MOA).

Step 4: Refine and Fine-Tune

  1. Move to the Target Distance: Shift to the chosen zeroing distance (e.g., 25, 50, or 100 yards) and adjust your aim accordingly.
  2. Fire More Shots: Fire additional shots to refine the zero. Aim at the center of the target and adjust the windage and elevation until the point of impact aligns with the point of aim.
  3. Check Consistency: Fire multiple shots to ensure consistency. If your shots consistently group off-center, make further adjustments.

Step 5: Confirm Zero

  1. Shoot Groups: Fire several groups of shots to confirm that the red dot sight is consistently zeroed. This helps account for any variations in your shooting technique.
  2. Make Final Adjustments: Fine-tune as needed. If the groups are consistently off-center, make slight adjustments to windage and elevation until satisfied.
  3. Document Settings: Record the final windage and elevation settings for future reference. This is particularly important if you plan to switch between different distances or ammunition.


  • Consistency is Key: Maintain a consistent shooting technique to get reliable and repeatable results.
  • Patience is Important: Take your time during the zeroing process to ensure precision. Rushing can lead to inaccurate adjustments.
  • Consider Ammunition Factors: If switching between different types of ammunition, be prepared to make slight adjustments to accommodate variations in ballistic characteristics.
  • Reconfirm Periodically: Periodically reconfirm your zero, especially after any significant changes to the firearm or sight setup.

Choosing the Right Zeroing Distance for Your Red Dot Sight

a person holding a gun with a red dot

Choosing the right zeroing distance for your red dot sight depends on various factors, including the intended use of the firearm, the type of ammunition, and your shooting preferences. Here are considerations to help you determine the appropriate zeroing distance:

1. Intended Use

  • Close-Range Shooting (Home Defense or Tactical)
    • For applications where engagements are likely to occur at close range, such as home defense or tactical situations, a shorter zeroing distance (e.g., 25 yards) may be suitable. This allows for quick target acquisition in close-quarters scenarios.
  • Mid-Range Shooting (General Purpose)
    • If your firearm serves a general-purpose role for a variety of distances, a mid-range zero (e.g., 50 or 100 yards) provides a good balance. 
  • Long-Range Shooting (Precision or Hunting)
    • For precision shooting or hunting scenarios where longer shots are common, a longer zeroing distance (e.g., 100 yards or more) may be preferable. 

2. Type of Firearm

  • Handguns: Handguns, especially those with shorter barrels, may benefit from a closer zeroing distance (e.g., 25 yards). Most likely, they will be used in point-blank or short distances.
  • Rifles: Rifles, with their longer effective ranges, often favor mid-range or longer zeroing distances. The choice depends on the specific rifle, ammunition, and typical usage.

3. Ammunition Ballistics

  • Different types of ammunition have varying ballistic characteristics. Consider the ballistics of the ammunition you plan to use and how it performs at different distances. Adjust the zeroing distance to match the trajectory of your chosen ammunition.

4. Personal Shooting Preferences

  • Holdover vs. Holdunder: Zeroing closer to the point of impact can result in a flatter trajectory, requiring less holdover for longer shots. Zeroing farther away may require some holdover for closer shots. Choose based on your preference and shooting style.
  • Quick Target Acquisition: Consider your comfort and speed in acquiring targets. A closer zero may provide quicker target acquisition, while a longer zero may require more precise aiming at shorter distances.

5. Environmental Factors

  • Consider the typical environmental conditions in which you’ll be shooting. If most of your shooting occurs in dense woods or urban environments, where longer shots are less common, a closer zero may be practical.

6. Manufacturer Recommendations

  • Refer to the manufacturer’s recommendations for your specific red dot sight. Some sights may be optimized for certain zeroing distances, and the manufacturer’s guidelines can provide valuable insights.

Factors That Might Require You to Re-Zero the Sight

There are times when you may need to re-zero and adjust the sight to maintain accurate shots. It’s essential to periodically check and readjust the zero to ensure consistent accuracy.

1. Changes in Ammunition: Switching to a different type or brand of ammunition can result in changes to bullet trajectory and point of impact. Whenever there’s a change in ammunition, re-zero the red dot sight to match the new ballistic characteristics.

2. Firearm Modifications: Any modifications to your firearm, such as changes in barrel length, muzzle devices, or the addition of accessories like suppressors, can impact the ballistics and require re-zeroing.

3. Mounting or Hardware Issues: Loose or damaged mounting hardware can cause shifts in the red dot sight’s alignment. If you experience any play or movement in the sight or if the mounting system has been disassembled and reassembled, re-zeroing may be necessary.

4. Environmental Changes: Significant environmental changes such as drastic changes in temperature can affect the ballistics of your ammunition. If you regularly shoot in diverse environments, consider re-zeroing to account for these variations.

5. Recoil Stress and Impact: Repeated recoil from firing rounds, especially on firearms with powerful recoil can cause the sight to shift over time. 

6. Sight or Optics Damage: Physical damage to the red dot sight can compromise its performance. If you observe any damage such as cracks, dents, or a distorted reticle, re-zero the sight after repairing or replacing damaged components.

7. Battery Replacement: Replacing the batteries may cause changes in brightness settings or reticle appearance. It’s advisable to re-zero the sight after changing batteries to confirm its accuracy.

8. Periodic Maintenance: After cleaning and lubricating your firearm, you may need to re-zero. Disassembling and reassembling parts can introduce slight changes in the firearm’s alignment.

9. Extended Storage: If your firearm, along with the red dot sight, has been in storage for some time, it’s wise to re-zero before using it again. Changes in environmental conditions during storage could affect the sight’s performance.

10. Frequent Use: Intensive or regular use of your firearm, especially in high-round-count sessions, can lead to wear and tear on components. This wear might affect the alignment of the red dot sight and necessitate re-zeroing to maintain accuracy.

11. Sight Adjustment Drift: Some red dot sights may experience gradual “drift” in their windage or elevation adjustments over time, even without external factors. This drift can result in a consistent shift in the point of impact, requiring re-zeroing.

12. Sighting In at Different Distances: If you frequently switch between shooting at different distances, each requiring a specific zero, you may need to re-zero the red dot sight accordingly. Different zeros are often necessary for short-range, mid-range, and long-range engagements.

How To Maintain the Sight’s Zero

Maintaining the zero of your red dot sight is crucial for consistent and accurate shooting.

1. Secure Mounting: Ensure that the red dot sight is securely mounted on your firearm. Use high-quality mounting hardware and follow the manufacturer’s instructions for proper installation. Check the tightness of screws and fasteners regularly.

2. Use Thread Locker: Apply a thread locker (such as Loctite) on mounting screws to prevent them from loosening due to recoil. Choose a thread locker suitable for your firearm and regularly inspect the screws to ensure they remain secure.

3. Consistent Shooting Technique: Maintain a consistent shooting technique, including your grip, stance, and trigger control. Consistency in your shooting mechanics contributes to more predictable shot placement and helps preserve the zero.

4. Check for Signs of Wear: Regularly inspect the red dot sight, its mount, and associated components for signs of wear or damage. Pay attention to any shifts, wiggling, or play in the sight. Address any issues promptly to maintain zero.

5. Avoid Strong Impacts: Handle your firearm with care and avoid unnecessary physical impact or dropping. Physical shocks can shift the internal components of the sight and affect its zero.

6. Periodic Re-Zeroing: Even with careful maintenance, periodic re-zeroing is recommended, especially if you notice changes in point of impact or experience significant environmental or equipment changes.

7. Record Zero Settings: Keep a record of your red dot sight’s windage and elevation settings for each zero distance. This documentation is valuable for quickly restoring the zero after disassembly or adjustments.

8. Reconfirm Zero After Maintenance: If you disassemble or perform maintenance on your firearm, red dot sight, or associated components, reconfirm the zero afterward. Changes in the assembly can impact the sight’s alignment.

9. Regular Battery Checks: For red dot sights with electronic illumination, regularly check the battery status. A low or failing battery can affect the brightness and performance of the reticle. Replace the battery proactively to maintain consistent illumination.

10. Avoid Extreme Conditions: Prolonged exposure to extreme conditions such as extremely high or low temperatures can affect the performance of your red dot sight and impact its zero. Thermal expansion or contraction may lead to shifts in the point of impact.

11. Use Protective Accessories: Protective accessories like lens covers, shrouds, or hoods help safeguard the red dot sight from physical damage, scratches, and exposure to debris. 

12. Follow Manufacturer Guidelines: Manufacturers provide specific guidelines for the care, maintenance, and usage of their red dot sights. Following these guidelines ensures that you are taking the correct steps to preserve the sight’s performance and accuracy.


Getting to grips with how to tweak your red dot sight is a critical step in becoming a sharpshooter. Comprehending MOA, windage, and elevation is useful in setting your sight accurately.

Keep in mind, aspects like weather conditions, changes in altitude, and the type of ammunition used may necessitate re-setting your sight. Regular upkeep ensures that your sight’s accuracy remains undisturbed.

Armed with these pointers, you’ll confidently manage your sight adjustments, ensuring each shot is on target.

It’s time to practice these skills in the field. Enjoy your shooting practice!

About the author

The name's Chris. Just a regular dude who loves firearms. I've been shooting since I was a kid. My old man taught me the ropes.

I'll never forget the first time I missed an easy shot on a buck, thanks to a bum scope. The image was fuzzier than my dog's butt. After that, I got obsessed with understanding scopes. What makes the good ones tick and the bad ones trash. After a few years and a few thousand bucks, I learned what separates the winners from the losers. Once I had a good stockpile of knowledge, I launched this site.

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