Red Dot Sighting Secrets

Published on December 12, 2025
Duration: 0:35

This guide, presented by DJ Shipley from GBRS Group, details the critical concept of height over bore for AR-15 style rifles equipped with red dot sights. It explains how the physical distance between the optic and the barrel affects point of impact, especially at close ranges. The video demonstrates how to compensate for this offset, particularly when zeroing at 25 yards and engaging targets in CQB scenarios, emphasizing the need for precise aiming adjustments to ensure hits in critical areas.

Quick Summary

Mastering height over bore with red dot sights on AR-15 rifles is essential for accurate shooting. This concept, explained by GBRS Group's DJ Shipley, involves understanding the vertical distance between your optic and barrel. It dictates aiming adjustments, particularly at close ranges, to ensure your bullet impacts where intended, crucial for CQB scenarios.

Chapters

  1. 00:00Understanding Holdovers
  2. 00:08Visualizing Bore Offset
  3. 00:19Compensating for Height Over Bore

Frequently Asked Questions

What is height over bore and why is it important for red dot sights?

Height over bore is the vertical distance between your optic's line of sight and your firearm's bore. It's crucial because it dictates where your bullet will impact relative to your aim point, especially at close ranges, requiring specific aiming adjustments.

How does a 25-yard zero affect point of impact with a red dot sight?

A 25-yard zero on an AR-15 with a red dot sight means your bullet will impact higher than your aim point for targets closer than 25 yards and generally lower than your aim point for targets beyond 25 yards, up to about 100 yards.

How should I aim at very close distances with a red dot sight?

At very close distances (e.g., 3-7 yards), you must aim significantly higher than your intended impact point to compensate for height over bore. For example, aiming at the head might be necessary to hit the chest area.

Who is DJ Shipley and what is his expertise?

DJ Shipley is an instructor with GBRS Group, bringing expertise from a Tier 1 Special Operations background. His instruction focuses on practical application of ballistics and tactical concepts for firearms.

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