SIG MCX Rifle: Mandatory Carriage Assembly Replacement Program

by
posted on January 5, 2017
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
sigmcx_carriageassembly.jpg

SIG Sauer is conducting a mandatory replacement of the carriage assembly in SIG MCX rifles. According to a statement from SIG Sauer, SIG has found through extensive factory testing that in extremely rare instances, not reported in the field and extremely difficult to replicate, a condition may exist causing an unintended discharge. Failure to follow the loading procedures and basic rules of safe firearms handling outlined in the user's manual has the potential to cause serious bodily harm or death. Although this has only been witnessed in 300 blackout, SIG has decided to upgrade all MCX models since the MCX is a modular platform and to ensure the quality and reliability of all products they manufacture. Certain serial numbers are exempt from this program

If you own one of these firearms, a SIG Sauer has issued these instructions:
Stop use of firearm immediately, and visit the SIG Sauer website as soon as possible to register your firearm, initiate the process and view a video explaining how to change out your carriage assembly. SIG will send you a prepaid box to return your complete carriage assembly to the factory. A new assembly, designed with the firing pin locking mechanism, will be shipped out to you within five to seven working days of the receipt of your parts at no cost to you. SIG will also send you a $50 gift voucher for any inconvenience this may have caused. This upgraded carriage assembly addresses this potential issue while enhancing the performance and longevity of your rifle. 






For all of the details relating to this issue, visit sigsauer.com

Latest

Cartridge Nomenclature
Cartridge Nomenclature

Deciphering (Mostly Nonsensical) Cartridge Nomenclature

If you’re perplexed by the naming practices used by our wildcatting forefathers and cartridge makers but are still curious about what they mean, read on.

The Armed Citizen® Jan. 19, 2026

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

"9 mm Optimized, But 10 mm Capable:" Dead Air's New RXD910Ti Suppressor

The new Dead Air RXD910Ti harnesses the technology of the patented Triskelion baffle system to make for a 9 mm-optimized silencer that is also capable for use with 10 mm pistol cartridges and more.

Revisiting A World War II Marine’s Story

Secretary of War Pete Hegseth, in his speech to 800 assembled generals, admirals and senior enlisted at Quantico, Va., on Sept. 30, 2025, quoted Eugene Sledge from his timeless classic With The Old Breed published in 1981.

Review: Leupold Rendezvous Soft Cases

Looking for something better than a cheap nylon bag, but don’t need it armored for air travel? Leupold has you covered.

Preview: Hiperfire Hipertrain

Hiperfire’s Hipertrain is a cast aluminum housing into which the AR-style trigger system, safety selectors and pistol grip of the user’s choice (none of which are included) can be installed to create a trigger demonstrator/dry-fire trainer

Interests



Get the best of American Rifleman delivered to your inbox.