How to Install a MP5 Barrel

The MP5 is a 9 mm submachine gun developed by Heckler & Koch in the 1960s. The weapon is produced in several models, some being fully-automatic and used by authorized personnel only. The MP5 is used widely across the globe by law enforcement and military personnel. As with all weapons, periodic maintenance may be needed from time to time, including replacing a faulty barrel. Removing and installing an MP5 barrel can be accomplished using a few special gunsmith tools.

Things You'll Need

  • Cleaning rod
  • Barrel vise
  • Propane torch
  • MP5 barrel lug/action wrench
  • Metal bonding solution
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Instructions

    • 1

      Unload the weapon completely. Remove the magazine. Pull the charging handle to the rear. Inspect the chamber to ensure that no live ammunition is present.

    • 2

      Unscrew the suppressor -- if applicable -- and remove it from the muzzle. Remove the sling from the weapon body.

    • 3

      Push the bolt and cocking lever to the forward position. Remove the buttstock locking pins with a cleaning rod. Remove the buttstock.

    • 4

      Pull and pivot the rear end of the trigger group down and away from the weapon receiver. Slide the bolt carrier group out of the back of the receiver.

    • 5

      Tap out the trigger group retention pin with a cleaning rod. Pull down on the trigger guard to remove the trigger group.

    • 6

      Tap out the fore-guard locking pin with a cleaning rod. Remove the fore-guard from the barrel.

    • 7

      Secure the barrel and receiver in a barrel vise. Heat the barrel lug using a propane torch for 30 to 45 seconds. This will help loosen any metal bonding solution that might've been used during manufacture.

    • 8

      Attach the barrel lug/action wrench to the barrel lug. Turn the barrel counterclockwise using the wrench until it's removed from the weapon.

    • 9

      Apply metal bonding solution to the new barrel threads. Screw the barrel onto the barrel lug and hand-tighten. Tighten the barrel using the barrel lug/action wrench back to its appropriate position. Ensure that the front sight is properly positioned as looking through the rear sight.