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MFI GSG MP40 9mm & Blue Line Solutions .22 LR Disk Safety / WWII Period Correct / Price Includes S&H via 1st Class USPS + Insurance



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Was: $125.00
Sale: $75.00
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- Gunsmith Required -
 * required
- USPS Priority Upgrade / 1st In L -
- No Export / US DOS or US DOC -
 * required
SHIPPING IS INCLUDED VIA USPS on orders over $82.00 Dollars AND OR If S&H is INCLUDED in the Title / Discription.


MFI GSG MP40 9mm & Blue Line Solutions .22 LR Disk Safety / WWII Period Correct / Price Includes S&H via 1st Class USPS + Insurance

NOTE: Unlike my other products for the GSG / ATI / Blue Line Solutions / MP40 this one requires a qualified Gunsmith to install it. I will be adding photos and videos as to tips for the Gunsmith to assure as easy a replacement as possible.

First of all lets talk about firearms safeties. I am guessing that in Germany where these are made they require a safety that impinges the sear and or hammer. I say this as the gun now has 2 safeties and the original WWII style with the bolt handle locked in the rear-most position is far superior to this rather questionable safety that they made out of cast pot metal none-the-less.

Additionally firearms safety is all about your trigger and your brain and not some mechanical device. This train of thought appears in current modern conceal and care handguns, where 80% have no safety at all. Many of us carry our autos with the slide locked back and safety off, much like you would the MP40 during WWII.

The new MFI Safety is made from weapons grade steel so it is far stronger and will last longer than the original. I made it as an exact copy of all the 7 - MP40s at my disposal, all of which are original and date from 1941 to 1943. All, but one are bnz manufacture. Regardless of year and manufacturer, they are all the same in appearance.

The hole on two sides is a simulation of the original, which is a drive pin / older style roll pin that keeps the original (take-down knob)from coming off. I positioned the holes to be visible like on the originals when the weapon's safety is in the "FIRE" position. This position can be confirmed without looking just be felling for the holes.

When rotated to the "SAFE" position all you see of feel are the knurls. These knurls are an exact copy in pattern, direction and depth to the original as well. If you turn the weapon upside down you will find 2 WWII waffenamts, these are to signify the "SAFE" position, so if they face sideways the weapon is in the "SAFE" mode. If front to back then in the "FIRE" mode. These waffenamts are copies of the bnz stamps "WaA 623".

The Original GSG MP40 Problem:

The Safety that comes with your GSG & MBlue Line Solutions MP40 takes the place of the original WWII Take-Down knob that releases the upper from the lower on the original SMG. They also made the knob a unique shape, which is completely wrong for anything WWII and certainly incorrect for the MP40. This has been a glaring eye sore as you know from countless forums. FINALLY we have a real solution.

The New MFI MP40 Period Correct Safety is a direct copy of the original from WWII in it's construction (the lower section) and it's external appearance. I copied exactly the top stem so it works exactly as the GSG / ATI safety.

MFI MP40 Safety cannot be removed or installed unless you take the entire lower section apart... meaning you split the two halves.

This item is NOT Plug and Play and REQUIRES A QUALIFIED GUNSMITH TO INSTALL It fits BOTH the GSG MP40 in 9mm and the GSG MP40 .22 LR BUT NOT an original MP40 from WWII.


  • Made from Weapons Grade Steel.
  • Finish: Mil. Spec. Black Oxide Finish to most closely simulate a finish that is found on the GSG MP40.
  • 100% MADE IN USA
  • 922r Compliant Part
  • Fits 9mm & .22 LR but NOT Original WWII MP40.
  • Looks identical to Original WWII Part.
  • Lifetime Guaranty: Like all MFI Products… You bend or break it, you get a new one at no cost.


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.


  • MFI
  • Available
  • New


Shipping Information

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

Customer Reviews

Comment Total Reviews (1)

The best replacement part for a GSG MP40
  • Currently 5/5 Stars

Reviewed by:

Product ownership: Less than 1 week

Purchased from: MFIAP.COM

I love this part, ever since buying my GSG l have disliked the GSG safety. It is ugly and oversized! The replacement part is well made and looks correct for the gun. You cannot go wrong by adding this to your GSG MP40.

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