4″ tri lug and 4 ” 1/2-28 tpi only barrels for early (FDE) Copperhead and Gen II/III MPX

As of the second week of August 2024 I have gone back to the old marking due to customer feedback;
0=zero gas
1=.040
2=.0469
3.052
4=.0625
This adjusts with a simple turn of the plug. With either an allen wrench or adjustable/box wrench. When the number is at the 12:00 position that is the port size it is on

Different setups require different amounts of gas depending on the actual gun itself, spring rate, suppressor generated back pressure and ammunition. This plug allows you the ability to “tune” your setup with the last amount of gas necessary to function, reducing gas feedback to the shooter. Your best method for tuning is to start on the largest port working backwards until the gun does not function then go up one click. You may need to adjust to more gas as the gun gets dirtier through the cycle.There is no one setting I can suggest for your setup with all the variables, it will require some testing by the end user. The plug insert is a consumable part and will erode over time as it is subjected to the hot chamber gasses which act as a type of plasma cutter. It will try to match the size of the port to the plug and erode the steel. this slows and still works as a funnel until eventually working all the way through. Erosion depends heavily on ammunition choice and suppression back pressure. There is not an alloy that I can machine that will prevent this/strong>

Gen-2  MPX-type replacement Drop-in Barrel & Gas Block assembly:

Thread protector is included.
You can also add a 1-piece HK-type 3-lug, machined directly onto most barrel.

All barrels 8″ and shorter are default shipped with .0625 gas port, longer barrels are shipped with .055 ports. All tri lug barrels also have 1/2-28 threads on the end and include thread protector. There is now an option for tri lug without threads
-41v50 CHM
-1:10 Riffling
-.438 Threaded muzzle on both tpi only and tri lug with tpi
-nitride finish

If you have questions or wish to share information and have Facebook you can join this group HERE

When using the adjustable plug in the mpx it is imperative to keep the “blind hole” in the plug clean of carbon buildup and ~.500 deep. If it becomes clogged the gas will not have an escape route and will start eroding the barrel extension. While this is not terminal for the barrel it will restrict your ability to restrict gas in the future. If you need advice on this please contact. If this is not something you wish to monitor or follow through with I highly suggest sticking with the open plug

I do not accept returns on barrels due to liability and cannot sell them as new once they are shipped out and returned. If there is a function issue obviously I will make that right if it is due to my product. Please, please, please make sure the barrel length and configuration is the proper one for your platform. I want people to be happy with their purchase and get the proper barrel for their platform in the length that is best suited to their purpose. If unsure please contact me first and I can possibly help with identification and input.

There is no additional cost for shipping it is included in the price of all listed parts.  Insurance is optional and separate, there is a box at the bottom of the checkout page where you can accept or opt out of the insurance.  ILWT cannot be responsible for lost or mishandled shipments once they are dropped to USPS. If you checkout without requesting insurance your item will be sent with only the amount afforded by USPS for your particular shipment which may not be anything for small items and up to $100.00 for some priority packages. Insurance will not let me file a claim if it is showing delivered so please make sure you put in the proper address or desire signature confirmation for an extra fee. By placing the order you acknowledge and accept this.

Please use drop-down menu for barrel length and 3-lug option, when ordering.

We use the tightest of tolerances and highest quality control.
All barrels and gas-blocks are proudly made in the USA and engraved ILWT.
All NFA Rules apply

*As with any barrel swap, have a qualified gunsmith check head-spacing before firing.

DISCLAIMER: “MPX” is a federally registered trademark of SIG SAUER, Inc. and is one of many trademarks owned by SIG SAUER, Inc.
Neither ILWT, LLC nor this website are affiliated in any manner with, or otherwise endorsed by, SIG SAUER, Inc.
The use of “MPX” on this page is merely to advertise the sale of MPX type barrels, parts, or components.

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