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

Published on April 20, 2015
Duration: 7:57

This video from Mrgunsngear tests the accuracy of lightweight AR-15 pencil barrels when heated. The test demonstrates that while accuracy degrades with heat, it often remains sufficient for practical applications. The speaker, a recognized firearms reviewer, uses a controlled methodology with thermal measurement to provide objective data.

Quick Summary

Lightweight AR-15 pencil barrels can lose accuracy when heated, showing increased dispersion after rapid fire. A test revealed group sizes opening from 0.75 inches cold to 1.75 inches hot at 100 yards. While accuracy degrades, it may remain sufficient for practical uses like home defense or hunting.

Chapters

  1. 00:19Introduction to Pencil Barrel Heat Test
  2. 00:34Rifle Specifications
  3. 01:04Cold Barrel Baseline Accuracy
  4. 02:46Heating the Barrel Rapidly
  5. 03:36Hot Barrel Accuracy Test
  6. 04:51Results and Analysis

Frequently Asked Questions

Do lightweight AR-15 pencil barrels lose accuracy when they get hot?

Yes, lightweight AR-15 pencil barrels can lose accuracy when heated. Testing showed group sizes increasing from 0.75 inches cold to 1.75 inches hot at 100 yards after rapid firing 30 rounds, indicating increased dispersion.

What factors influence the accuracy of a lightweight AR-15 barrel?

The primary factor influencing accuracy in lightweight barrels during rapid fire is heat buildup. As the barrel heats, metal expansion can cause slight shifts in harmonics and rigidity, leading to increased shot dispersion.

Is a lightweight AR-15 barrel still accurate enough for practical use?

According to the test, while accuracy degrades with heat, the dispersion increase may still be acceptable for many practical applications like home defense or hunting, where extreme precision under sustained fire isn't the primary requirement.

What components were used in the AR-15 heat accuracy test?

The test rifle featured a Faxon Firearms 16-inch pencil barrel, Gemtech suppressor, CMT Tactical receiver set, Wilson Combat trigger, and a Trijicon AccuPower 1-4x scope, using Federal Premium match ammunition.

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