Pro Tip - Quickly Zeroing an AR-15

Published on April 23, 2017
Duration: 6:00

This guide details a rapid zeroing technique for an AR-15, as demonstrated by John Lovell. It focuses on compensating for mechanical offset at close range to achieve an approximate 100-yard zero quickly, especially useful in field conditions without precise distance measurements. The method involves measuring the distance between the bore and optic, then using a close-range shot to predict the impact point and make initial adjustments.

Quick Summary

John Lovell's pro tip for quickly zeroing an AR-15 involves measuring the height-over-bore (mechanical offset) and using a close-range shot (approx. 5 yards) to predict impact. This technique compensates for the difference between the bore and optic lines of sight, allowing for an approximate 100-yard zero without needing a known distance range.

Chapters

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

Frequently Asked Questions

What is the 'quick zero' method for an AR-15?

The quick zero method involves measuring the height-over-bore (distance between the barrel and optic), then firing at a close range (approx. 5 yards) to predict impact. This compensates for mechanical offset, allowing for an approximate 100-yard zero without needing a known distance range.

How do you measure 'height-over-bore' on a rifle?

Height-over-bore is measured by finding the vertical distance between the center of the rifle's barrel and the center of the optic's line of sight. A common technique is to use a pen or similar object to bridge the gap and visually estimate or measure this distance.

Why is mechanical offset important for zeroing a rifle?

Mechanical offset is crucial because the bore and optic are not perfectly aligned. Understanding this offset allows you to predict where your rounds will impact relative to your point of aim, especially at close distances, enabling faster and more accurate zeroing.

What gear is shown in the AR-15 quick zeroing video?

The video features a 5.56 AR-15 build equipped with a Gemtech suppressor and an Aimpoint T1 red dot sight, demonstrating a practical setup for tactical applications and field zeroing.

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