Lightweight AR-15 Barrels Are Not Accurate When Hot? Test. (HD)

Published on April 20, 2015
Duration: 7:57

This test evaluates the accuracy of lightweight AR-15 'pencil' barrels when heated. A Faxon 16-inch pencil barrel rifle was tested, showing a cold group of 0.75 inches and a hot group of 1.75 inches after rapid firing. While accuracy degrades, the dispersion remained acceptable for practical uses like home defense or hunting.

Quick Summary

Lightweight AR-15 'pencil' barrels lose accuracy when hot, with group sizes increasing significantly after rapid fire. A test showed groups opening from 0.75 inches cold to 1.75 inches hot, though still considered sufficient for defense or hunting.

Chapters

  1. 00:19Intro: Pencil Barrel Heat Test
  2. 00:34Rifle Build & Specs
  3. 01:04Cold Barrel Accuracy Baseline
  4. 02:46Heating the Barrel Rapid Fire
  5. 03:36Hot Barrel Accuracy Test
  6. 04:51Results & Analysis: Hot vs. Cold

Frequently Asked Questions

Do lightweight AR-15 barrels lose accuracy when hot?

Yes, lightweight AR-15 'pencil' barrels tend to lose some accuracy when heated from rapid firing. A test showed group sizes increasing from 0.75 inches cold to 1.75 inches hot at 100 yards.

What temperature does an AR-15 barrel reach during rapid fire?

During rapid firing of 30 rounds, the barrel temperature near the gas block can reach approximately 250-270°F, significantly impacting accuracy.

Is a lightweight AR-15 barrel still accurate enough for defense or hunting?

While accuracy degrades, the dispersion increase from a hot lightweight barrel is often still sufficient for practical applications like home defense or hunting, where extreme precision isn't always required.

What rifle components were used in the lightweight barrel accuracy test?

The test rifle featured a 16-inch Faxon Firearms pencil barrel, Gemtech suppressor, CMT Tactical upper/lower, Wilson Combat trigger, and a Trijicon AccuPower 1-4x scope.

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