M855A1 - 14.5” barrel vs. 20” barrel.

Published on June 27, 2024
Duration: 1:01

This video from Military Arms Channel empirically compares the muzzle velocity of M855A1 ammunition fired from a 14.5-inch barrel versus a 20-inch barrel. The expert analysis, utilizing a chronograph, demonstrates a significant velocity increase with the longer barrel, providing valuable data for firearm enthusiasts and ballistics researchers. The content highlights the importance of barrel length in achieving optimal performance from specific ammunition types.

Quick Summary

Military Arms Channel empirically tested M855A1 ammunition, finding a significant velocity difference between barrel lengths. A 20-inch barrel yielded approximately 3090 FPS, while a 14.5-inch barrel produced around 2900 FPS, a gain of about 190 FPS with the longer barrel.

Chapters

  1. 00:00Introduction and Context
  2. 00:3114.5” Barrel Velocity Test
  3. 00:4620” Barrel Velocity Test and Comparison

Frequently Asked Questions

What is the difference in M855A1 muzzle velocity between a 14.5-inch and a 20-inch barrel?

Testing by Military Arms Channel shows M855A1 ammunition achieves approximately 2900 FPS from a 14.5-inch barrel and around 3090 FPS from a 20-inch barrel. This results in a velocity increase of about 190 FPS with the longer barrel.

How does barrel length affect the performance of M855A1 ammunition?

Barrel length significantly impacts M855A1 ammunition's muzzle velocity. A longer barrel, such as a 20-inch, allows for more complete powder burn, resulting in higher velocities compared to shorter barrels like a 14.5-inch.

What equipment was used to measure M855A1 velocity in the Military Arms Channel video?

The Military Arms Channel video used a LabRadar chronograph to accurately measure the muzzle velocity of M855A1 ammunition fired from both the 14.5-inch and 20-inch barrels. This empirical data provides reliable ballistics information.

Which AR-15 barrel length is better for M855A1 ammunition?

For maximizing M855A1 ammunition's muzzle velocity, a 20-inch barrel is demonstrably better, yielding approximately 190 FPS more than a 14.5-inch barrel. The choice depends on the user's needs for velocity versus rifle maneuverability.

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