H&K MG4: Germany's New 5.56mm Squad Machine Gun

Published on June 7, 2025
Duration: 11:40

This guide details the field stripping process for the H&K MG4, a 5.56mm light machine gun. Expert Ian McCollum demonstrates how to disassemble the weapon into its primary component groups, highlighting the removal of the buttstock, recoil spring, grip assembly, and bolt carrier group. The process involves the use of captive pins and emphasizes the stamped steel receiver construction.

Quick Summary

The H&K MG4 is a 5.56mm light machine gun adopted by Germany in 2005, Spain and Portugal in 2007. It operates from an open bolt with 'Safe' and 'Full Auto' fire modes. A key feature is its quick-change barrel system, allowing removal independent of bolt position, facilitated by an independent front trunnion.

Chapters

  1. 00:00Introduction and History
  2. 01:34Markings and Controls
  3. 02:02External Features
  4. 03:31Sights and Optics
  5. 04:10Quick-Change Barrel System
  6. 05:30Feed Mechanism
  7. 06:42Field Stripping and Internals

Frequently Asked Questions

What is the H&K MG4 and who uses it?

The H&K MG4 is a 5.56mm light machine gun developed by Heckler & Koch. It was adopted by the German military in 2005 and later by Spain and Portugal in 2007, designed to compete with firearms like the FN Minimi.

How does the H&K MG4's barrel system work?

The MG4 features a quick-change barrel system that allows the barrel to be removed independently of the bolt position. This is achieved through an independent front trunnion that manages headspace, though it increases manufacturing complexity.

What are the key features of the H&K MG4's controls and operation?

The H&K MG4 operates from an open bolt and has a simple fire selector with only 'Safe' and 'Full Auto' positions. It does not feature a semi-automatic setting. The weapon is belt-fed and uses disintegrating links.

Can the H&K MG4 be easily field stripped?

Yes, the H&K MG4 can be field stripped by removing captive pins to detach the buttstock, recoil spring, and grip assembly. The bolt carrier group is a single unit that can then be removed.

Related News

All News →

More Gunsmithing & DIY Videos You Might Like

More from Forgotten Weapons

View all →