SIG MCX 11.5″ Barrel 5.56 NATO Upper Assembly


Original price was: $1,789.99.Current price is: $1,120.79.

SIG MCX 11.5″ Barrel 5.56 NATO Upper Assembly

MCX Upper Assembly

We Ship with: Upper, Bolt Carrier Group, Charging Handle, Taper Cap. This is ONLY the upper assembly.


Sig Sauer MCX Upper 11.5″ Barrel Upper Assembly, 5.56 NATO, Tapered Lug, MLOK. Available in 5.56 NATO, This item includes: a Sig Sauer MCX upper assembly, 90 degree muzzle adapter for standard non Sig Sauer suppressors, and a MCX owner’s manual. The kit features a 11.5″ barrel with a thread pitch of 5/8″ x 24 TPI.

The MCX Virtus upper receiver assembly features a standard free-floating M-LOK handguard with a top picatinny rail for sight and optic, as well as a short-stroke piston system and unique internal recoil system that eliminate the M4-style buffer tube resulting in a light-recoiling and compact platform able to be configured for any task.



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MCX Upper Assembly

SIG MCX 11.5″ Barrel 5.56 NATO Upper Assembly

MCX Upper Assembly

The SIG MCX VIRTUS Pistol is ready for any mission and designed to perform beyond 20,000 rounds without the need for replacement parts. To enhance accuracy, it features the Sig MatchLite Duo trigger, free-float M-Lok handguards, a full-length optics-ready top rail, and ambidextrous, AR-style controls.

MCX 11.5″ Barrel 5.56 NATO Upper Assembly


The upper receiver does not meet the 16″ minimum barrel length requirement, and requires registration and a tax stamp with the Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE) when assembled into a complete rifle. Additional state and local restrictions may apply. It is the sole responsibility of the buyer to comply with any and all applicable laws.

Availability:In Stock


  • Barrel Length: 11-1/2″
  • Barrel Thread Pitch: 5/8″ x 24 TPI
  • Brand: Sig Sauer
  • Caliber: 5.56x45mm
  • Finish / Color: Black
  • Firearm Type: Pistol,Rifle
  • Material: Steel,Aluminum
  • Models Fit: AR-15,SIG516,M400