Pro Tip - Quickly Zeroing an AR-15

Published on April 23, 2017
Duration: 6:00

This video demonstrates a quick zeroing method for an AR-15 using the height-over-bore principle. By measuring the distance between the optic and the barrel center, shooters can achieve an approximate 100-yard zero with a close-range shot. This technique accounts for mechanical offset, ensuring rounds impact predictably below the point of aim at short distances, which then aligns with the bullet's trajectory at longer ranges.

Quick Summary

The quick zeroing method for an AR-15 uses the height-over-bore principle. Measure the distance between your optic and barrel center, then fire at 5 yards. Adjust your optic so the impact is below your aim point by that measured distance, ensuring you're 'on paper' at 100 yards.

Chapters

  1. 00:00Introduction & Gear
  2. 00:30The 'Quick Zero' Concept
  3. 01:16Measuring Height-Over-Bore
  4. 02:42Live Fire Demonstration
  5. 03:30Trajectory & Adjustments

Frequently Asked Questions

What is the height-over-bore method for zeroing an AR-15?

The height-over-bore method involves measuring the distance between your optic's center and your barrel's center. You then fire a shot at very close range (like 5 yards) and adjust your optic so the impact is below your point of aim by that measured distance.

How does the quick zeroing technique work for AR-15s?

This technique uses the principle that at close range, your bullet will impact below your point of aim due to the optic being higher than the bore. By matching this offset distance at 5 yards, you ensure your rifle is roughly zeroed for 100 yards.

Why is measuring height-over-bore important for zeroing?

Measuring height-over-bore, also known as mechanical offset, is crucial because it quantifies the difference between your aiming point (optic) and the bullet's initial trajectory (bore). This allows for predictable adjustments.

Can I use this quick zero method with a suppressor on my AR-15?

Yes, the quick zeroing method using height-over-bore is effective regardless of whether you are using a suppressor. The suppressor does not significantly alter the initial bullet trajectory relative to the bore at close range.

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