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GSG MP40 - MFI Barrel Extension 13mm X 1.0 Pitch RT - 6.80" long. Price includes S&H for 1st Class Mail & Insurance. / 922r Compliant / Shroud NOT included

Designed specifically to fit the GSG MP40 Pistols to extend from 10" barrel to BATF 16" Legal Length.


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Special GSG MP40 - MFI 6.80 Barrel Extension 13mm X 1.0 Pitch RT. Price includes S&H for 1st Class Mail & Insurance. / 922r Compliant.

Price INCLUDES USPS 1st Class Mail & Insurance..

If you want FASTER SHIPPING click the "Expedited Shipping" Tab and choose the Priority Mail Upgrade for just $5.75 more.


  • 100% Made in the USA!
  • The made of Weapons Grade Steel.
  • Heat Treated to about Rockwell 27.
  • Precision CNC machined from billet.
  • Threaded 13mm X 1.0 Pitch Right Hand to a depth of 0.650"
  • Maximum Length: = 172.72mm or 6.80 inches.
  • Maximum Barrel Extension: = 157.48mm or 6.20 inches.
  • Maximum I.D. @ 0.692"
  • Maximum O.D. @ 0.800"
  • Weight: 4.1 ounces!
  • Mil. Spec. Black Oxide to give the unit a semi matte finish without any oil on it, otherwise it looks semi-gloss. The Photo has been lightened to show detail and profile.
  • Can be Custom Trimmed / Shortened

The MFI M4 Style Fake Silencers / Barrel Shrouds / Barrel Extensions / Adapters do NOT reduce muzzle noise or muzzle flash in any way. So, these are 100% legal for the regular civilian to own in all 50 US States.

We deliberately made this adapter / barrel extension out of steel so it can easily be to meet BATF permanently attached criteria via MIG or TIG welding. Aluminum extensions are a bad idea as the heat exchange from firing will erode the inside of the aluminum extension very quickly, whereas steel lasts almost forever. All NFA & BATF Rules apply.

Fake Silencers are also known as: Dummy Can, Faux Suppressor, Mock Silencer, Barrel Shroud & Non-Functional Sound Suppressor.

No FFL needed, No Special License, No Permit Required & No Special Tax Stamp needed to order.

MFI MP40 6.80" Inch Long Barrel Extension COMES WITH:

  • 1 - Adapter / Barrel Extension ONLY


In accordance with the Joe Biden & Beto O’Rourke directive I personally as well my company no longer own(s) or possess any firearms or ammunition. This includes but is not limited to: Handguns, Pistols, Shotguns, Rifles, NFA items, Hog Legs, Fire Sticks, Smoke Poles and or Thunder Clubs.

All firearms that appear on our web site, regardless of what is written about them, are not owned by the company nor possessed by anyone associated with MFI and may even be CGI / PhotoShop.

Therefore regardless of any new firearms laws / taxes, no probable cause can EVER be assumed on any property (stationary or mobile) owed by myself or MFI.

AGAIN: We are 100% in compliance with any possible new “Biden / O’Rourke Public Safety Act” and therefore NO PROBABLE CAUSE could ever be assumed.

Lastly anyone arriving with a warrant of any kind will be assumed to be an IMPOSTER with intent on murdering us and will be treated as such without warning.

Those invading our territory may receive serious and even fatal wounds from rusty blades, clubs with bent nails, spear tips, arrows and or crossbow bolts.


This item is NOT RESTRICTED FOR DOMESTIC US SALES in any way and we offer DOMESTIC USA shipping to ANYONE. We ship to all 50 US States as well as all US Territories i.e. Guam & Puerto Rico. Sorry we can NOT ship to ANY APO address regardless of actual location.

This item is 100% RESTRICTED FOR EXPORT OUTSIDE THE USA. The US Department of State regulates / restricts this product and it is NOT EXPORTABLE outside the USA even to LE, Governments or Military without State Department approval.

This approval is AVAILABLE through MFI as we are an ITAR / Dept. of State Registrant with the Directorate of Defense and Trade Controls Office. We can obtain a US State Dept. Export License for you.

Please feel free to contact us if you have any questions on this issue.


  • BE-6.80-RT-13MMX1.0
  • BE-6.80-RT-13MMX1.0
  • MFI
  • New


Shipping Information

  • Item Requires Shipping
  • 0.4 lbs.
  • SHIPPING IS INCLUDED VIA USPS on orders over $82.00 Dollars AND OR If S&H is INCLUDED in the Title / Discription.

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