Portugal's MG-13: the M938 Light Machine Gun

Published on May 2, 2019
Duration: 18:10

This guide details the field stripping process for the Portuguese M938 (MG-13) light machine gun, as demonstrated by Ian McCollum of Forgotten Weapons. It covers the removal of the top cover, bolt and carrier assembly, and barrel, highlighting key internal components like the recoil spring and the adjustable mainspring tension knob. The process emphasizes safe handling and understanding the weapon's unique mechanical features, including its closed-bolt firing and short-recoil operation.

Quick Summary

The Portuguese M938, also known as the MG-13, is a light machine gun operating on a short recoil principle with a tilting locking block and firing from a closed bolt. It was manufactured by Rheinmetall in Germany and can use 25-round box or 75-round drum magazines. A notable feature is its adjustable mainspring tension knob.

Chapters

  1. 00:00Introduction to the MG-13
  2. 01:20Historical Context and Naming
  3. 01:58Basic Mechanical Overview
  4. 03:47External Features and Controls
  5. 05:59Sighting Systems
  6. 07:39Disassembly and Internal Components
  7. 10:22Barrel and Bolt Removal
  8. 14:21Fire Control Group Analysis

Frequently Asked Questions

What is the Portuguese designation for the MG-13 machine gun?

In Portugal, the MG-13 machine gun was designated as the M938. This designation was part of a strategy to potentially bypass limitations imposed by the Treaty of Versailles on German arms production.

How does the MG-13 operate mechanically?

The MG-13 operates using a short recoil system with a tilting locking block. Unusually for its class, it fires from a closed bolt, contributing to its accuracy potential.

What types of magazines can the MG-13 use?

The MG-13 is compatible with both a 25-round curved box magazine and a larger 75-round double drum magazine, offering flexibility in sustained fire capability.

What unique feature does the MG-13 possess for mainspring adjustment?

The MG-13 features a distinctive mainspring tension adjustment knob located on the receiver, marked with a numbered scale from 1 to 4, allowing users to modify the spring force.

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