American rifles in 7.62x39? Good or bad?

Published on November 24, 2023
Duration: 0:52

This review from Military Arms Channel examines the Sig Sauer MCX-SPEAR in 7.62x39mm. The analysis highlights the challenges of adapting the AR-15 platform to this cartridge, particularly concerning magazine design and reliability due to the 7.62x39mm's case taper. The speaker, Tim, offers an expert assessment based on practical experience.

Quick Summary

The Sig Sauer MCX-SPEAR in 7.62x39mm faces challenges adapting to the AR-15 platform, primarily due to the cartridge's taper requiring highly curved magazines. Military Arms Channel's expert analysis suggests potential reliability concerns with these magazines compared to AK-pattern designs, despite the rifle's short-stroke gas piston system and other features.

Chapters

  1. 00:00Introduction: Sig Spear 7.62x39mm
  2. 00:15Magazine Design Challenges for 7.62x39mm
  3. 00:30Reliability and Design Critique
  4. 00:45Live Fire Demonstration

Frequently Asked Questions

What are the main challenges of chambering the 7.62x39mm cartridge in an AR-15 platform rifle like the Sig Sauer MCX-SPEAR?

The primary challenge is the 7.62x39mm cartridge's taper, which requires a significantly curved magazine to feed reliably from a standard AR-15 magwell. This extreme curvature can sometimes lead to feeding issues compared to AK-platform magazines designed for this cartridge.

How does the Sig Sauer MCX-SPEAR in 7.62x39mm perform when suppressed?

During rapid fire sequences, the Sig Sauer MCX-SPEAR in 7.62x39mm demonstrated reliable cycling and effective gas venting when equipped with a suppressor, indicating good performance in this configuration.

What is the speaker's opinion on the magazine design for 7.62x39mm AR-pattern rifles?

The speaker expresses a preference for AK-style magazines, citing concerns about the reliability of highly curved AR-pattern magazines designed for the 7.62x39mm cartridge. The extreme curvature needed for STANAG-style magwells is a point of critique.

What technical features does the Sig Sauer MCX-SPEAR offer?

The Sig Sauer MCX-SPEAR chambered in 7.62x39mm features a short-stroke gas piston system, ambidextrous controls, and a folding stock. It is designed to be compatible with STANAG-style magazines, albeit with a proprietary curve for the 7.62x39mm cartridge.

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