Mud Test: Sig MCX Spear - US Army NGSW

Published on May 20, 2022
Duration: 9:23

This guide details a rigorous mud test performed on the Sig MCX Spear, the US Army's NGSW choice. It covers initial function checks, extreme mud application with both open and closed dust covers, and systematic clearing techniques for failures to feed, fire, and eject. The analysis highlights the challenges piston-driven systems can face in such conditions and the importance of understanding gas settings.

Quick Summary

The Sig MCX Spear, chambered in 6.8x51mm (.277 Fury) and selected for the US Army's NGSW program, faced significant reliability issues during an extreme mud test. While functional with the dust cover closed, direct mud ingress with the cover open caused failures to feed and fire, which were difficult to clear even with specialized techniques.

Chapters

  1. 00:00Introduction & Baseline Check
  2. 00:44Closed Dust Cover Mud Test
  3. 01:46Open Dust Cover Mud Test & Failures
  4. 02:23Persistent Failures & Clearing Attempts
  5. 05:25Technical Analysis: Piston vs. DI
  6. 06:39Adverse Gas Setting Test

Frequently Asked Questions

How did the Sig MCX Spear perform in an extreme mud test?

The Sig MCX Spear initially functioned with its dust cover closed but experienced failures to feed and fire when mud was directly applied to the action with the dust cover open. Clearing attempts were unsuccessful, indicating mud ingress into critical components.

What are the key differences between piston and DI systems in mud?

Piston systems like the MCX Spear can be more susceptible to mud affecting the action and fire control group. Direct Impingement (DI) systems may have an advantage in self-cleaning due to gas venting debris away from the action.

What clearing techniques were attempted on the Sig MCX Spear during the mud test?

Attempts included using the side charging handle, clean magazines, and mortaring the rifle. Switching to the 'adverse' gas setting was also tested but did not resolve the persistent malfunctions.

What caliber is the Sig MCX Spear tested and what is its military designation?

The Sig MCX Spear tested is chambered in 6.8x51mm, also known as .277 Fury. It is the chosen rifle for the US Army's Next Generation Squad Weapon (NGSW) program.

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