Why Your AR-15 Shoots Low

Published on August 29, 2019
Duration: 6:53

This expert-level guide from Lucky Gunner Ammo explains mechanical offset, the critical difference between sight height and bore height, and its impact on AR-15s and similar rifles. It details how this offset causes rounds to hit low at close distances, demonstrating practical shooting exercises to illustrate the effect at various ranges. The instruction emphasizes the necessity of practice for subconscious compensation in real-world scenarios and advises against zeroing for extremely close ranges for general use.

Quick Summary

Your AR-15 shoots low at close distances due to mechanical offset, the vertical distance between your sight's line of aim and the bore's line of trajectory. At 3 yards with a 50-yard zero, expect impacts about 2.5 inches low. This effect becomes negligible by 25 yards. Practice is crucial for subconscious compensation.

Chapters

  1. 00:02Introduction to Mechanical Offset
  2. 00:26Demonstration at Close Range (3 Yards)
  3. 01:03Effect at Varying Distances (5-25 Yards)
  4. 01:36Applies to All Sights (Red Dots & Irons)
  5. 02:05Relevance in Combat, Home Defense, Competition
  6. 03:01Shooting Around Obstacles
  7. 04:00Practice and Subconscious Compensation
  8. 04:41Zeroing for Home Defense: Is it Ideal?
  9. 05:26Consequences of Close-Range Zero
  10. 06:12Recommendation: Practice Your Offset

Frequently Asked Questions

Why does my AR-15 shoot low at close distances?

Your AR-15 shoots low at close distances due to mechanical offset. This is the vertical distance between your sight's line of aim and the bore's line of trajectory. At very close ranges, like 3 yards, the bullet's path is still rising from the bore, causing it to impact below where your sights are aligned.

How much does mechanical offset affect my AR-15 at 3 yards?

With a typical 50-yard zero on an AR-15, you can expect your rounds to hit approximately 2.5 inches lower than your point of aim at a distance of 3 yards. This effect diminishes as the distance to the target increases.

Should I zero my AR-15 for home defense at 10 yards?

Zeroing your AR-15 for extremely close ranges like 10 yards for home defense is generally not ideal. While it ensures accuracy at that specific distance, it makes the rifle significantly over-shoot targets beyond 10 yards, rendering it unusable for most practical scenarios. A longer zero, like 50 yards, offers a much wider effective range.

Does mechanical offset only affect magnified optics on an AR-15?

No, mechanical offset affects all types of sights on an AR-15, including red dot sights and traditional iron sights. The principle is based on the physical distance between the bore and the sight, not the magnification of the optic.

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