Smyth Busters: Does "Mil-Spec" Mean "Low Quality"?

Published on May 11, 2021
Duration: 4:18

Instruction from Caleb and Steve at Brownells clarifies the meaning of 'Mil-Spec' in firearms components. They explain that true Mil-Spec involves military production and inspection, while civilian market 'Mil-Spec' often refers to dimensional standards or quality benchmarks without official certification. The video highlights receiver extensions and upper receivers as examples, emphasizing that Mil-Spec generally signifies higher quality materials and manufacturing, not necessarily the lowest cost.

Quick Summary

Mil-Spec firearm components are produced under military contracts with rigorous inspection and documentation. Civilian market 'Mil-Spec' parts often follow similar dimensional or quality standards but lack official military certification. Mil-Spec generally signifies higher quality materials and manufacturing, particularly for parts like receiver extensions made from 7075 T6 aluminum.

Chapters

  1. 00:03Introduction: Smyth Busters & Mil-Spec Myth
  2. 00:07Myth: Mil-Spec Means Low Quality
  3. 00:14Defining Mil-Spec: Quality vs. Size Standard
  4. 00:34True Mil-Spec: Military Production & Inspection
  5. 00:50Civilian Market 'Mil-Spec' Components
  6. 01:00Example: Receiver Extensions (Buffer Tubes)
  7. 01:16Mil-Spec Receiver Extension Requirements
  8. 01:36Commercial Receiver Extension Differences
  9. 02:08Identifying Mil-Spec vs. Commercial Features
  10. 02:33Internal Parts & Mil-Spec Standards
  11. 02:59Example: Upper Receivers
  12. 03:15Choosing Mil-Spec or Reputable Brands
  13. 03:22Impact of Component Quality on Reliability
  14. 03:52Conclusion: Mil-Spec Quality

Frequently Asked Questions

What is the difference between true Mil-Spec and civilian market 'Mil-Spec' firearm components?

True Mil-Spec components are manufactured under strict military contracts, undergo rigorous inspection, and have extensive documentation. Civilian market 'Mil-Spec' components often adhere to similar dimensional standards or quality benchmarks but lack official military certification and oversight.

Are Mil-Spec AR-15 receiver extensions (buffer tubes) made of specific materials?

Yes, Mil-Spec receiver extensions are typically required to be constructed from 7075 T6 hard coat anodized aluminum and must meet precise dimensional specifications for proper fit and function with compatible stocks.

Can commercial AR-15 receiver extensions be used with Mil-Spec parts?

While they might fit, commercial receiver extensions often have a slightly larger exterior diameter than Mil-Spec versions. This difference can cause compatibility issues with certain Mil-Spec stocks, leading to a loose fit.

Does 'Mil-Spec' always mean higher quality for AR-15 parts?

Generally, yes. Mil-Spec designation implies adherence to robust material and manufacturing standards set by the military, which typically results in higher quality and reliability compared to uncertified commercial parts, especially for demanding use.

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