Sig Sauer SIG MCX 5.56 NATO Semi-Auto 16” Short Stroke Rifle w/ Accessories

SOLD FOR: $1,576

WOA#: WY240130JM005

Make: Sig Sauer

Model:  MCX

Serial Number: 63C016731

Year of Manufacture: Modern

Caliber: 5.56/.223

Action Type: Semi-Automatic, Short-Stroke Gas Piston

Markings: The left side of the receiver is marked “SIG / SIG MCX MULTI-CALIBER”, “SIG SAUER INC. / EXETER-NH-USA”, “63C016731” with bullet pictograms for the safety.  The right side of the receiver is marked with bullet monograms for the safety selection options.  The BCG is marked “MULTI-CAL”.  The barrel is marked “5.56 NATO 1/7”.  The left side of the upper is marked “SIG MCX”.

Barrel Length: 16”.  17.75” with 3-Prong flash hider.

Sights / Optics:  The top of the rifle is a monolithic picatinny rail mounted with a set of flip up adjustable backup sights.

Stock Configuration & Condition:  The buttstock is a skeletonized folding stock with ambi QD cups and rubber buttpad. The pistol grip is textured polymer with serrated front and backstrap.  The handguard is a Keymod.  The LOP measures 13” from the front of the trigger to the back of the buttpad at full extension.  The stock rates in Excellent condition with light handling wear. Has ambidextrous safety. The receiver has ambi QD cups at the rear. The mag release is a bullet button.

Magazine Quantity & Condition: Two 5.56×45 PMAG in Excellent condition.

Type of Finish:  Black

Finish Originality: Original

Bore Condition: The bore is bright and the rifling is sharp.  There is no erosion in the bore.  In this writer’s opinion the bore rates 10/10.

Overall Condition:  This rifle retains about 99% of its metal finish.  The left side of the upper receiver has a scratch and both sides of the handguard have a few small scuffs. There are some scratches and scuffs on the flash hider.   The screw heads are sharp and pins are unmarred. The markings are clear.  Overall, this rifle rates in about Excellent condition.

Mechanics:  The action functions correctly.  We did not fire this rifle.  As with all used firearms, a thorough cleaning may be necessary to meet your maintenance requirements.  Has ambidextrous safety.  The mag release is a bullet button.

Box, Paperwork & Accessories:  This rifle comes with a total of two magazines, owner’s manual, and two Sig KeyMod Picatinny rail adapters.

Our Assessment: The Sig Sauer MCX in 5.56 NATO is a highly versatile and modular semi-automatic rifle designed for adaptability, reliability, and performance across a wide range of operational environments. Introduced by Sig Sauer, a company renowned for its commitment to innovation and quality in firearms manufacturing, the MCX platform has been developed to meet the demanding requirements of modern military, law enforcement, and civilian shooters.

The MCX is engineered with a gas-operated, short-stroke piston system that reduces recoil and improves the rifle’s reliability under adverse conditions, distinguishing it from the direct impingement systems commonly found in other rifles. This system allows for consistent performance, even in extreme environments, making it a preferred choice for professionals worldwide. One of the key features of the MCX is its modularity, which enables users to quickly change barrel lengths, calibers (with conversion kits), and configure the rifle for various missions or shooting preferences without the need for specialized tools.

Chambered in 5.56 NATO, the MCX offers the advantage of using a widely available and standard NATO cartridge, known for its effectiveness in both close-quarters combat and medium-range engagements. The rifle’s design includes a fully ambidextrous control setup, making it accessible to a broad range of shooters, and features such as a folding stock (on certain models) enhance its compactness and ease of transport.

Furthermore, the MCX’s compatibility with a variety of accessories and sighting systems, including suppressors, optics, and lights, allows users to tailor the rifle to their specific needs, whether for tactical applications, competition shooting, or recreational use. Its advanced design, combined with Sig Sauer’s reputation for durability and precision, has made the MCX a popular choice among those who demand the best in modern firearm technology.  Please see our photos and good luck on your bid! – L.S.

Sig Sauer SIG MCX 5.56 NATO Semi-Auto 16” Short Stroke Rifle w/ Accessories
Sig Sauer SIG MCX 5.56 NATO Semi-Auto 16” Short Stroke Rifle w/ Accessories