Proud to be on the Frontline on the war on terror!

Additional Images

ADA Brace Solution / MFI 9" Long Barrel Extension with 5/8 X 24 tpi Right Hand Thread with up to .65 Caliber / Large 0.692" I.D. Price includes S&H for 1st Class Mail. Super Light Weight. 922r Compliant Part.

Designed specifically to fit the AR15 Pistols to extend from 8.50" barrel to BATF 16" Legal Length.


Limited Supply: only 3 remaining
Was: $135.00
Sale: $85.00
Save: 37%
Save: $50.00

Customize Your Item

- Custom Cut To Length -
- 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 9 Inch Long Adapter / Barrel Extension for SOCOM & M4 Style Fake Silencers / Barrel Shrouds (HK USC45 / USC-45 Length) 5/8 X 24 tpi Right Hand Thread with Large 0.692" I.D. Price includes S&H for 1st Class Mail. 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.

Also available in other thread patterns (Call or email for details: 760-728-7079 or

This page is ONLY for the ADAPTER / BARREL EXTENSION seen in the 1st photo above.

You may also order (at an additional cost) the M4 or SOCOM Fake Silencer / Barrel Shrouds seen in the above photos that slides over and hides part or all of the extension.

Here are the links to the M4 Style Barrel Shrouds: MFI M4 HK USC45 Blank / No Engraving Fake Silencer / Barrel Shroud

MFI M4 HK USC45 Kampfswimmer Marked Fake Silencer / Barrel Shroud

MFI SOCOM HK USC 45 Fake Silencer / Barrel Shroud

This adapter / barrel extension is weapons grade steel. The length is 229mm / 9.015 inches, which if permanently attached will give you about 16.25" of barrel (assuming you have a 7.75" barrel). This added length will give you the much-needed barrel length to make a 100% BATF legal rifle. It also qualifies as a 922r Compliant part.

NOTE: Even though the overall length of this adapter is 9.015" part of that is the threads. As you can only count the threaded area once (threads in the adapter overlap the threads on the barrel) the total ADDED LENGTH to any weapons system's barrel would be about 8.50". For example, a 7" barrel with this adapter will end up being only 15.375" long, so too short for BATF 16" legal length. The final length you end up with also depends on how long your threads are. So, when measuring, you measure from the shoulder where the threads bottom out on the barrel backwards to the bolt face. Do not count any threads on the barrel. Then subtract that number from 16" and that is your minimum length or extension required.

NOTE TO SHORTEN THE EXTENSION: If you want to shorten the adapter / barrel extension you can do so by trimming down the front end. The I.D. of the rear section for about 0.750" in length has a 5/8 X 24 thread (I.D. is about 0.486"), but just forward of the threaded area the I.D. of the extension expands to 0.692" wide. This accommodates any caliber up to and including .45 ACP with plenty of room for expanding gas so as not to cause bullet deflection upon point of impact. You can trim it yourself or have us "Custom Cut / Trim it to any length under 9.0". Contact me for a quote... generally it is about $50.00. If you do cut / trim the extension to a shorter length know that the front inside diameter of the shroud MUST seat against the front outer diameter of the barrel. This means that if you shorten the extension by 2 inches then you MUST have at least 2 inches of barrel to cover or the front of the extension will not rest against the front shoulder of the inside of the shroud.

So now you can turn your AR15 parts set or AR15 PDW Pistol into a legal semi rifle. This will fit any weapon with a 5/8 X 24 Right Hand Thread. The internal hole diameter that the bullet passes through is 0.692" in diameter. We made this large enough to keep the escaping gases from affecting the bullet trajectory. The larger hole size also helps keep the weight down. In the end this is much lighter than a long 16' barrel version. The weight of the product is only 5.8oz!


  • 100% Made in the USA!
  • The made of Weapons Grade Steel.
  • Heat Treated to about Rockwell 27.
  • Precision CNC machined from billet.
  • Threaded 5/8 X 24 tpi Right Hand
  • Maximum Length: = 229mm or 9.015 inches.
  • Maximum Barrel Extension: = 215.9mm or 8.50 inches.
  • Maximum I.D. @ 0.692"
  • Maximum O.D. @ 0.800"
  • Weight: 5.8 ounces!
  • Mil. Spec. Black Oxide to give the unit a semi matt 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 Barrel Extensions / Adapters can easily be Blind Pinned & Welded to BATF specifications / regulations via regular MIG welding to comply with "permanently attached" guidelines.

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.

MFI 9 Inch Long Barrel Extension COMES WITH:

  • 1 - Adapter / Barrel Extension ONLY

No FFL needed, No Special License, No Permit , No Proof of Age & No Special Tax Stamp needed to order.


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 all lost in a terrible boating accident. This includes, but is not limited to: Handguns, Pistols, Shotguns, Rifles, NFA items, Hog Legs, Fire Sticks, Smoke Poles, WMDs, Alien Death Rays, Phasers, Lasers, Storm Trooper Blasters, Directed Energy Weapons, Nukes and or Thunder Clubs.

So, I no longer need the US Government's gracious and altruistic offer to buy back any weapons "real, imaginary or things that might identify themselves as weapons" for their "HEAP BIG WAMPUM"!

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 AI / 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, crossbow bolts and or Big Mike's man member.


States in IL & NY have recently defied the Supreme Count's Rules and continue to enact new gun laws.

TO BE 100% CLEAR! MFI (in essence me as I am a one man show) having studied Constitutional Law in Collage see ALL STATE LAWS that limit firearms in any manner as a violation of BOTH the 2nd Amendment and the 10th Amendment.

I WILL ship ALL MFI PRODUCTS to all 50 US STATES regardless of your state's "opinion" or "feelings" or "regulations" as these are absolutely 100% Unconstitutional.

Additionally we will NEVER turn over any records of our customers to ANYONE regardless of their threats or illegitimately and illegally obtained court order.


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-9-RT-5/8X24
  • BE-9-RT-5/8X24
  • MFI
  • Available
  • 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.

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.

Share ADA Brace Solution / MFI 9" Long Barrel Extension with 5/8 X 24 tpi Right Hand Thread with up to .65 Caliber / Large 0.692" I.D. Price includes S&H for 1st Class Mail. Super Light Weight. 922r Compliant Part. on Facebook

Items: 0
Total: $0.00

Why Shop From MFIAP?

Fast Shipping

SHIPPING IS INCLUDED on all orders over $82.00 See our detailed shipping rates. 60 Day Money Back on Returns. View our policies and procedures.

Superior Customer Service

Find the answers to commonly asked questions.

Secure Web Transactions

All transactions involving personal information are secured through SSL encryption.