CZ Bren 2Ms 7.62x39 Stovepipes: Cause and possible solutions.

Published on November 9, 2020
Duration: 21:05

This guide details the diagnosis and potential solutions for stovepipe malfunctions in the CZ Bren 2Ms 7.62x39. Expert analysis, including high-speed footage, reveals the primary cause is an over-gassed system leading to excessive bolt velocity. While modifications to the gas plug have shown promise, users are advised to contact CZ for warranty service rather than attempting DIY fixes.

Quick Summary

Stovepipe malfunctions in the CZ Bren 2Ms 7.62x39 are typically caused by an over-gassed system leading to excessive bolt carrier velocity. This prevents reliable ejection. While diagnostic tests show modifying the gas plug can help, CZ does not sell spare parts for this, so contact them for warranty service.

Chapters

  1. 00:00Introduction to Bren 2Ms Issues
  2. 01:50Initial Range Observations
  3. 04:16Mechanical Comparison: SCAR and ACR
  4. 06:35Gas System and Bolt Velocity
  5. 09:01The Target of Truth: Data Summary
  6. 13:36Testing Modified Gas Plugs
  7. 17:42Conclusions and Recommendations

Frequently Asked Questions

What causes stovepipe malfunctions in the CZ Bren 2Ms 7.62x39?

Stovepipe malfunctions in the CZ Bren 2Ms 7.62x39 are primarily caused by the firearm being significantly over-gassed. This leads to excessive bolt carrier velocity, preventing the extractor and ejector from reliably clearing the spent casing before the bolt returns forward.

Are there user-fixable solutions for CZ Bren 2Ms 7.62x39 stovepipes?

While modifications like reducing the gas port size on the gas plug have shown promise in diagnostic testing, CZ does not offer spare parts for such modifications. Users experiencing issues should contact CZ for warranty service rather than attempting DIY fixes.

How does the CZ Bren 2Ms compare mechanically to other rifles like the SCAR or ACR?

The CZ Bren 2Ms shares more mechanical design elements with the Bushmaster ACR, particularly its short bolt travel, which contrasts with the FN SCAR 16s' longer bolt stroke. This short travel contributes to the ejection timing challenges observed in the Bren 2Ms.

What is the recommended action for a malfunctioning CZ Bren 2Ms 7.62x39?

If your CZ Bren 2Ms 7.62x39 is experiencing stovepipe malfunctions, the recommended action is to contact CZ for warranty service. The manufacturer is aware of potential engineering discrepancies and is investigating the issue.

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