Sig Sauer MCX AR Pistol With Pistol Stabilizing Brace (300 BLK)
MCX 300BLK-1a
MCX 300BLK-1MCX 300BLK-2MCX 300BLK-3MCX 300BLK-4MCX 300BLK-5MCX 300BLK-6MCX 300BLK-7


1 in stock




Engineered from the ground up to be short, light, and silenced, the SIG MCX features an innovative auto-regulating or two position, short-stroke gas piston operating system. Users can change barrels, calibers, stocks, and handguards in the field.


Unlike every other firearm on the market, the SIG MCX was built for optimum performance with the 300BLK cartridge and a suppressor. The outcome is a firearm with superior suppression capability and enhanced reliability with both supersonic and subsonic loads A two-position gas block makes the transition from subsonic to supersonic as fast as flipping the lever. Changing between 300BLK and 5.56 NATO is as simple as swapping barrels and magazines in a matter of minutes. Converting to 7.62x39mm simply requires barrel, magazine, as well as an additional bolt change. Each SIG MCX features an aluminum KeyMod handguard, AR-style lower controls and utilizes standard STANAG magazines. A revolutionary recoil system does not require a buffer tube, allowing the side-folding Pistol Stabilizing Brace. A picatinny top rail allows for the mounting of lights or optics. The aluminum forend allows for rail sections to be added where they are needed, permitting the attachment of accessories. The lower receiver offers familiar AR-style controls. Completely ambidextrous controls include the safety, magazine release and charging handle.


Side-Folding Pistol Stabilizing Brace
This revolutionary brace offers maximum flexibility and improved single-handed shooting performance.


User-Changeable Barrel with 3-Prong Flash Hider
Choose from 16-inch 5.56 NATO, 300BLK and 7.62×39 barrels offering in-field adaptability. Reducing your signature, a 3-prong flash hider comes standard.


Additional Information
ManufacturerSig Sauer
ModelMCX w/Pistol Stabilizing Brace
TypePistol:  Semi-Auto
Caliber300 BLACKOUT/300 Whisper
ActionGas Operated Semi-Auto
SightsNo Sights
Barrel Length9.0″
Overall Length26″
Weight7.2 lbs
AccessoriesSig SBX Stabilizing Brace, One 30-Round Steel Magazine
Product UPCPMCX-300B-9B-PSB

Additional Information Content


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