Sig Sauer M400 Tread

Published on January 14, 2019
Duration: 24:54

This review of the Sig Sauer M400 Tread, presented by Tim from Military Arms Channel, offers an objective and technically critical assessment of Sig's sub-$1,000 AR-15 offering. With high authority, Tim details the rifle's specifications, including its 16-inch stainless steel barrel with a 1:8 twist, direct impingement gas system, and M-LOK handguard. The review covers initial reliability testing, ergonomics, unboxing, and a crucial headspace check using a no-go gauge, providing valuable insights for potential buyers.

Quick Summary

The Sig Sauer M400 Tread is a budget-friendly AR-15 with a 16-inch, 1:8 twist stainless steel barrel and direct impingement gas system. It passed initial reliability tests, including a hot/cold headspace check. While generally solid, the M-LOK handguard can overheat quickly due to a lack of rear cooling holes.

Chapters

  1. 00:00Introduction to the Sig M400 Tread
  2. 01:22Optics and Initial Reliability
  3. 02:15Controls and Ergonomics
  4. 03:51Barrel and Handguard Specifications
  5. 05:34Range Testing and Magazines
  6. 07:46Unboxing and Accessories
  7. 09:20Zeroing and Accuracy
  8. 11:16Final Thoughts and Headspace Check

Frequently Asked Questions

What are the key specifications of the Sig Sauer M400 Tread?

The Sig Sauer M400 Tread features a 16-inch stainless steel barrel with a 1:8 twist rate, chambered in 5.56 NATO. It utilizes a direct impingement gas system and comes with a slim M-LOK handguard. Its MSRP is approximately $900, and it typically includes one 30-round Magpul PMAG.

How reliable is the Sig Sauer M400 Tread based on the review?

The reviewer noted the M400 Tread has been 100% reliable through initial testing, including passing a 'no-go' headspace test both hot and cold after firing 450 rounds. Brass ejection was slightly erratic, but the rifle maintained headspace.

What are the pros and cons of the Sig Sauer M400 Tread's handguard?

The M400 Tread features a slim M-LOK handguard, which is aesthetically pleasing. However, a significant con is the lack of cooling holes at the rear, causing it to heat up uncomfortably fast during rapid fire, suggesting a potential need for an aftermarket upgrade.

What accessories are included with the Sig Sauer M400 Tread?

The rifle typically ships in a cardboard box with an owner's manual, a cable lock, one 30-round Magpul PMAG, and a chamber flag safety indicator. Notably, backup iron sights are not included and require separate purchase and installation.

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