M240B Guts and Field Strip

Published on May 7, 2015
Duration: 3:33

This guide details the field stripping procedure for the M240B machine gun, a variant of the FN MAG. It covers the removal of the barrel, gas plug, stock, bolt carrier group, op-rod, bolt, trigger group, top cover, and feed tray, emphasizing the importance of spare barrels for operational readiness. The process highlights the weapon's reliability, referencing its performance in historical conflicts.

Quick Summary

The M240B field stripping process begins with removing the barrel by depressing a left-side latch and lifting it out. Next, the gas plug is removed by twisting its collar. The stock slides off after pressing a bottom latch. The bolt carrier group, op-rod, and bolt assembly are then removed after releasing spring tension. Finally, the trigger group and top cover/feed tray are detached by removing their non-captive pins.

Chapters

  1. 00:00Introduction to the M240B
  2. 00:24Removing the Barrel
  3. 00:49Adjusting the Gas Plug
  4. 01:17Removing the Stock
  5. 01:36Accessing the Bolt Carrier Group
  6. 01:48Removing the Recoil Spring
  7. 01:55Removing the Bolt Carrier Group Assembly
  8. 02:14Removing the Trigger Group
  9. 02:41Removing the Top Cover and Feed Tray Pin
  10. 02:54Removing the Top Cover and Feed Tray
  11. 03:03Field Stripped M240B Overview

Frequently Asked Questions

What are the main steps for field stripping an M240B machine gun?

Field stripping the M240B involves removing the barrel by depressing a latch and rotating the handle, then removing the gas plug by twisting its collar. Next, the stock is removed by pressing a bottom latch. The bolt carrier group, op-rod, and bolt assembly are then accessed and removed after releasing spring tension. Finally, the trigger group and the top cover/feed tray assembly are removed by pushing out their respective non-captive pins.

Why is it important to carry a spare barrel for the M240B?

General-purpose machine guns like the M240B generate significant heat during sustained fire. Carrying a spare barrel allows for rapid replacement of a hot barrel with a cold one, ensuring continuous operation and preventing potential damage or malfunctions caused by overheating.

How does the gas plug on the M240B function?

The gas plug on the M240B has three settings, labeled 1, 2, and 3. Setting '3' has the largest port, diverting the most gas into the action to cycle the weapon. This setting is typically adjusted only when the firearm is malfunctioning, as the weapon is designed for reliability.

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