Basic AR-15 Practical Accuracy

Published on August 26, 2016
Duration: 26:30

This guide details establishing a practical accuracy baseline for a standard AR-15 using iron sights, as demonstrated by Iraqveteran8888. It covers shooting techniques for consistent accuracy at 100, 250, and 300 yards, the impact of barrel heat during rapid fire, and the role of components like the trigger and gas system. The instruction emphasizes realistic expectations for budget builds and the importance of fundamentals for effective shooting.

Quick Summary

Iraqveteran8888 demonstrates the practical accuracy of a basic CMMG Mk4 LE AR-15 build using iron sights. At 100 yards, expect around 5-inch groups with 55gr FMJ. At 300 yards, iron sights limit precision due to front sight obstruction. Barrel heat causes shot stringing, and a mil-spec trigger can impact shooter accuracy.

Chapters

  1. 00:00Introduction and Build Overview
  2. 02:22100-Yard Accuracy Test
  3. 03:36Extended Range: 250 to 300 Yards
  4. 09:01Heat and Rapid Fire Effects
  5. 11:11The Role of the Trigger
  6. 12:32Barrel Twist and Gas System Observations

Frequently Asked Questions

What is the practical accuracy of a basic AR-15 with iron sights at 100 yards?

A basic AR-15 build, like the CMMG Mk4 LE tested, can achieve practical accuracy of around 5 inches at 100 yards using standard 55-grain FMJ ammunition and iron sights, with consistent fundamentals.

How does barrel heat affect an AR-15's accuracy?

During rapid fire, barrel heat can cause shot stringing on standard AR-15s with non-free-floated barrels. This means shots will migrate from the initial point of aim as the barrel heats up, degrading precision.

What is the role of a mil-spec trigger in AR-15 accuracy?

A standard mil-spec trigger is durable but its heavier pull and staged break can limit shooter accuracy. A match trigger offers a lighter, crisper break, allowing the shooter to achieve better precision by minimizing disturbance during the shot.

What does forward brass ejection indicate on an AR-15?

Forward ejection of brass (around the 1-2 o'clock position) often indicates an over-gassed AR-15 system. This might be addressed with a heavier buffer or recoil spring to tune the rifle's cycling.

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