MANUFACTURER: SIG SAUER
MODEL: MCX
COUNTRY OF ORIGIN: UNITED STATES
CALIBER: 5.56 NATO
BARREL LENGTH: 16.00"
BARREL FEATURES: 5.56 NATO RIFLED BARREL, INTERCHANGEABLE MCX BARREL SYSTEM, THREADED MUZZLE
MUZZLE / THREAD PITCH: 1/2X28 TPI / 3-PRONG FLASH HIDER
OPERATING SYSTEM: SHORT-STROKE PISTON
TWIST RATE: 1:7 RH
GAS SYSTEM: 2-POSITION ADJUSTABLE GAS VALVE
OPTIC READY: FULL-LENGTH PICATINNY TOP RAIL
FIREARM FINISH: BLACK ANODIZED
CONDITION: VERY GOOD, LIGHT HANDLING WEAR
ADDITIONAL FEATURES: SELF-CONTAINED RECOIL SYSTEM, M-LOK ACCESSORY INTERFACE
WHAT’S INCLUDED: UPPER RECEIVER

This Sig Sauer MCX 16.00" 5.56 NATO upper is built for shooters who want serious duty-grade capability without being chained to the traditional AR buffer-tube architecture. Designed around SIG’s modular MCX platform, this upper brings a compact self-contained operating system, full-length optics rail and modern M-LOK interface into one hard-use package. Whether the mission is patrol, defensive use, training or building out a modular general-purpose carbine, this is a hell of a capable foundation.

The heart of the MCX is its short-stroke gas-piston operating system rather than conventional AR direct impingement. The 16.00" 5.56 NATO configuration uses a 1:7 RH twist and Sig’s adjustable gas system, with factory MCX Virtus documentation identifying a two-position gas valve. That piston architecture keeps the operating system self-contained inside the upper and was engineered around reliability, modularity and sustained practical use rather than range-toy aesthetics.

This is not another generic AR upper wearing tactical furniture. The MCX V was engineered from the start as a modern piston-driven modular system, and the 16.00" 5.56 NATO setup delivers the barrel length, accessory real estate and operating architecture serious users expect from a full-capability carbine. If your build demands Sig’s MCX system instead of another copy of the standard formula, this upper belongs in the loadout.

***Please see pictures for condition and wear***

SHIPPING INFORMATION:
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WE TRY TO SHIP FIREARMS THE SAME DAY PAYMENT/FFL IS RECEIVED.
WE SHIP TO ALL 50 US STATES
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Layaway is available on purchases of $749.99 and above, see Additional Terms of Sales for details.

BIDDING PROCEDURES:
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DISCLAIMER
All pre-owned firearms offered by National Armory are thoroughly inspected by our on-site gunsmith to ensure they are in proper working condition. While test firing may or may not be conducted, all firearms are evaluated for basic function and safety. It is solely the buyer’s responsibility to be familiar with and comply with all federal, state, and local laws regarding firearm ownership and accessory restrictions, including but not limited to magazine capacity and prohibited features. All sales are final.

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