AR15 How To Truly Zero An ACOG

Published on October 6, 2024
Duration: 10:46

This guide details a precise method for zeroing an AR-15 equipped with an ACOG optic, emphasizing the importance of muzzle velocity, ballistic calculations, and a multi-stage zeroing process. It covers initial rough zeroing at 25 yards, establishing a 100-yard base zero, and fine-tuning the zero to match the ACOG's BDC reticle for accurate long-range holdovers. The instructor highlights specific ACOG reticle behaviors and adjustment procedures.

Quick Summary

To truly zero an AR-15 with an ACOG, start by measuring muzzle velocity and inputting data into a ballistic calculator like Chairgun. Perform a rough zero at 25 yards, then a precise 100-yard zero. Finally, verify and adjust the ACOG's BDC reticle holds against your calculated drops for accurate long-range engagement.

Chapters

  1. 00:01Introduction: Zeroing Process for ACOGs
  2. 00:42Step 1: Muzzle Velocity & Ballistic Calculator Setup
  3. 02:45Adding Ammunition to Ballistic Calculator
  4. 03:24Ballistics Table Settings
  5. 03:51Step 2: Rough Zero at 25 Yards
  6. 05:42Step 3: Base Zero at 100 Yards
  7. 06:34Trijicon ACOG Adjustment Protocol
  8. 07:14Step 4: Final Zero & BDC Alignment
  9. 08:56Step 5: Confirming Your Zero
  10. 10:08Zero Confirmation Results
  11. 10:19Conclusion: Zeroing Process Recap

Frequently Asked Questions

What is the recommended method for zeroing an AR-15 with an ACOG optic?

The recommended method involves first determining muzzle velocity, then using a ballistic calculator like Chairgun to input rifle, optic, and ammo specs. A rough zero is established at 25 yards, followed by a precise 100-yard zero, and finally, aligning the ACOG's BDC reticle with calculated drops for accurate long-range shooting.

How do you calculate the scope height over bore for an ACOG on an AR-15?

For an AR-15 with a standard Picatinny rail, the height from the barrel center to the rail is about 1.2 inches. An ACOG TA51 mount adds approximately 1.5 inches. Therefore, the total scope height over bore is roughly 2.7 inches.

What is the significance of zeroing at 100 yards versus shorter distances?

Zeroing at 100 yards is preferred because it magnifies any minor errors in optic alignment that might be missed at closer ranges. These magnified errors become more apparent and easier to correct at the longer 100-yard distance, leading to a more reliable zero.

Does Trijicon recommend any special procedure when adjusting ACOG turrets?

Yes, Trijicon's documentation suggests lightly tapping the optic after each turret adjustment. This is believed to help reset the internal prism mechanism. While its necessity is debated, following this procedure is recommended by the manufacturer.

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