4.5″ 1/2-28 barrels back in stock
Custom laser engraving available on barrels by request for an additional charge
Newer griffin tri lug mounts may not work with this tri lug assembly. Older Griffin and all other manufacturer products that are in spec are not an issue
Gen-1 MPX-type replacement Drop-in Barrel & Gas Block assembly:
Our proven 4140 hard-melonite barrel, pre-installed/pinned in a gas-block with included piston and gas plug. These units are drop in ready
There is no additional cost for shipping it is included in the price of all listed parts. If you would like special services for shipping such as insurance or signature confirmation please make an account on our site and contact us for a shipping quote. ILWT cannot be responsible for lost or mishandled shipments once they are dropped to USPS. Small orders of light parts may not have a tracking number if shipped via usps first class postage 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. 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 are gas-blocks are proudly made in the USA and engraved ILWT.
Gas Port will be a matched .060 for both block and barrel
*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.
4.5" .5-28 tpi only, 4.5" tri lug with .5-28 tpi, 6.5" .5-28 tpi only, 6" tri lug with .5-28 tpi, 8" .5-28 tpi
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Returns and Exchanges
There are a few important things to keep in mind when returning a product you purchased.You can return unwanted items by post within 7 working days of receipt of your goods.
- You have 14 calendar days to return an item from the date you received it.
- Only items that have been purchased directly from Us.
- Please ensure that the item you are returning is repackaged with all elements.
Ship your item back to Us
Firstly Print and return this Returns Form to:
30 South Park Avenue, San Francisco, CA 94108, USA
Please remember to ensure that the item you are returning is repackaged with all elements.
For more information, view our full Returns and Exchanges information.