The M7 NGSW (Sig Spear MCX) is less reliable than the AR15 in mud.

Published on October 17, 2023
Duration: 1:01

Instruction from Karl Kasarda of InRangeTV details a mud reliability test on the Sig Spear MCX (M7 NGSW). The rifle initially functions with the dust cover closed but malfunctions when the dust cover is open, highlighting a key difference in reliability compared to AR-15 platforms in adverse conditions. The guide covers basic clearing steps for such malfunctions.

Quick Summary

Karl Kasarda of InRangeTV analytically tested the Sig Spear MCX (M7 NGSW) in mud, finding it less reliable than the AR-15 when the dust cover was open. AR-15s may clear debris better due to their direct impingement gas system venting. The M7 NGSW malfunctioned, failing to cycle and go into battery, highlighting potential vulnerabilities of piston systems in extreme conditions.

Chapters

  1. 00:00Dust Cover Closed Test
  2. 00:09Dust Cover Open Test & Malfunction
  3. 00:17Malfunction Clearing Attempt
  4. 00:27Mechanical Comparison (Piston vs. DI)

Frequently Asked Questions

How does the Sig Spear MCX (M7 NGSW) perform in mud compared to an AR-15?

The Sig Spear MCX (M7 NGSW) showed less reliability in mud than the AR-15, particularly when its dust cover was open. While it fired successfully with the dust cover closed, it malfunctioned when the cover was open, failing to cycle and go into battery.

Why might an AR-15 be more reliable in mud than a piston-driven rifle like the M7 NGSW?

AR-15s, using a direct impingement system, vent gas from the bolt carrier group. This venting action can help clear debris. Piston systems, like the M7 NGSW, lack this inherent self-cleaning attribute when the dust cover is open, making them potentially more susceptible to mud ingress and malfunctions.

What are the basic steps to clear a malfunction in the M7 NGSW after a mud test?

After a mud-induced malfunction, attempt to clear the action by cycling the charging handle. Then, try inserting a fresh magazine with clean ammunition. If the rifle fails to go into battery, further clearing or disassembly might be required.

What specific rifle models were compared in the mud test?

The video primarily compares the Sig Spear MCX (M7 NGSW) against the AR-15 platform. It also references the HK MR416 and HK MR556 as other piston-actuated systems.

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