DS-39: The Failed Soviet Machine Gun of World War Two

Published on May 26, 2021
Duration: 13:50

This guide details the field stripping process for the rare Soviet DS-39 machine gun, as demonstrated by Ian McCollum. It covers the removal of major components like the recoil spring tube, trigger group, and bolt assembly, offering insights into its unique internal mechanisms, including Degtyarev-style locking flaps and an accelerator lever. The expert-level instruction highlights the complexity and specific design choices of this historical firearm.

Quick Summary

The Soviet DS-39 machine gun, developed as a 'universal' replacement for the Maxim, featured air-cooling, a dual rate of fire (600/1200 RPM), and a Shpagin-style feed. Despite its advanced design for the era, it suffered critical reliability failures like out-of-battery detonations, leading to its limited production and replacement by the SG-43 Goryunov.

Chapters

  1. 00:00Introduction to the DS-39
  2. 01:00Design Features and History
  3. 02:47Internal Mechanics and Feed System
  4. 04:20Sights and Controls
  5. 05:18Rate of Fire Adjustments
  6. 06:40Field Stripping Process
  7. 08:15Component Analysis
  8. 11:13Service Failure and Legacy

Frequently Asked Questions

What were the main design goals for the Soviet DS-39 machine gun?

The DS-39 was developed as a 'universal machine gun' intended to replace the older Maxim. It was designed for multiple roles, including vehicle mounting, anti-aircraft fire, and standard infantry support, featuring air-cooling and a dual rate of fire.

Why did the Soviet DS-39 machine gun ultimately fail in service?

The DS-39 experienced significant reliability issues, most notably out-of-battery detonations and violent extraction that could pull bullets from their cartridges. These critical flaws led to its limited production and eventual replacement.

What are the key internal mechanical features of the DS-39?

The DS-39 employs a Shpagin-style feed mechanism and Degtyarev-style locking flaps. It also incorporates a unique accelerator lever to enhance cycling reliability, a feature absent in lighter designs like the DP-27.

How is the rate of fire adjusted on the DS-39?

The rate of fire on the DS-39 is adjustable via a two-position recoil buffer and a setting on the gas block. This allowed for different rates, typically 600 RPM for infantry and 1200 RPM for anti-aircraft use.

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