Least Reliable AR-15 Yet?

Published on January 25, 2015
Duration: 43:04

This guide details the process of enlarging an AR-15's gas port to improve reliability, a modification performed by the video's speaker on a LaRue Tactical Stealth Upper. The speaker, demonstrating high technical authority, explains this was a last resort after multiple manufacturer returns failed to resolve chronic short-stroking issues, especially in cold weather. The modification, while effective, highlights a significant flaw in an expensive product and underscores the importance of proper gas system tuning for optimal AR-15 function.

Quick Summary

Chronic short-stroking in an AR-15, particularly in cold weather, often indicates an under-gassed system. While manufacturers may claim functionality, persistent issues can necessitate user intervention. In one documented case, enlarging the gas port on a LaRue Tactical Stealth Upper was required for 100% reliability, demonstrating that even high-cost components can have flaws requiring DIY gunsmithing.

Chapters

  1. 00:00Field Failure in Winter Conditions
  2. 02:56The Six-Year Reliability Saga
  3. 06:52Troubleshooting and Manufacturer Returns
  4. 11:15The DIY Solution: Drilling the Gas Port
  5. 14:49Velocity and Barrel Length Philosophy
  6. 18:09Competitive Options and Custom Builds
  7. 21:18Final Accuracy Results and Conclusion

Frequently Asked Questions

What causes an AR-15 to short-stroke or fail to cycle?

Short-stroking in an AR-15 is often caused by an under-gassed system, meaning insufficient gas pressure is cycling the bolt carrier group. This can stem from a gas port that is too small, a malfunctioning gas block, or issues with the bolt carrier group itself, particularly noticeable in adverse conditions like cold weather.

How can AR-15 reliability issues be resolved?

Resolving AR-15 reliability issues can involve troubleshooting the gas system (checking gas port size, gas block alignment), ensuring proper lubrication, using quality ammunition, and verifying the function of the bolt carrier group. In some cases, like the LaRue Stealth Upper discussed, manually enlarging the gas port may be necessary after other solutions fail.

What is the difference between a 20-inch and 18-inch AR-15 barrel?

A 20-inch AR-15 barrel generally offers higher muzzle velocity (around 150-200 FPS more with heavy bullets) compared to an 18-inch barrel, benefiting long-range accuracy. However, an 18-inch barrel is lighter and shorter, improving maneuverability and reducing overall rifle weight, making it a popular choice for carbine builds.

Is it normal to modify a high-end AR-15 upper receiver?

While ideally not necessary for premium products, modifying components like the gas port on an expensive AR-15 upper receiver (e.g., LaRue Stealth) may become a last resort if reliability issues persist after manufacturer attempts to fix them. This highlights potential quality control or design flaws that require user intervention.

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