Sig Sauer Mcx Rspear6816Bng Mcx-Spear 68X51 16 20R Coy

The Sig Sauer MCX-Spear in 6.8x51 is a civilian-market rifle built on the same platform the U.S. Army selected as its next-generation service rifle. With a 16-inch cold hammer-forged barrel, this semi-automatic rifle delivers the ballistic performance and reliability that defined a major shift in military small-arms capability—now available to American shooters and hunters. The 6.8x51 cartridge, paired with Sig's hybrid ammunition, achieves velocities exceeding 3,000 fps and represents a genuine leap in mid-to-long-range terminal performance.

What sets the MCX-Spear apart is its thoughtful engineering for serious use. The gas piston operating system with an adjustable, two-position gas valve keeps the action reliable across different ammunition loads and conditions. Ambidextrous bolt and catch releases, a non-reciprocating rear charging handle and side charging handle option, and fully ambidextrous controls make it equally at home for right- or left-handed shooters. The curved-profile Matchlite Duo trigger breaks clean, and the free-floating, M-LOK-compatible handguard gives you attachment points for lights, grips, and optics without binding the barrel.

The 16-inch barrel keeps the rifle handy in the field or at the bench, while the push-button folding Magpul SL-M stock collapses for transport or tight shooting positions. Coyote anodized receivers and a durable polymer grip round out a package that refuses to apologize for its military heritage. One 20-round AR-10 pattern magazine is included. The MCX-Spear also supports caliber conversions to 7.62x51, 6.5 Creedmoor, and 13-inch barrel options, so your platform investment can adapt as your needs evolve.

Built for precision, modularity, and dependability, the MCX-Spear is a purpose-built rifle for hunters and shooters who demand performance that matches its pedigree.

Key Features

• 16-inch cold hammer-forged barrel in 6.8x51 with 1:7 twist rate
• Gas piston operating system with adjustable two-position gas valve
• Fully ambidextrous controls—bolt catch, charging handles, and controls
• Curved Matchlite Duo trigger for clean, repeatable breaks
• Free-floating M-LOK handguard for attachment flexibility
• Non-reciprocating side and rear charging handle options
• Push-button folding Magpul SL-M telescoping stock
• SLX/SLH quick-detach flash hider (5/8"-24 threads)
• Optics-ready platform with no iron sights; Picatinny rail ready for your optic
• Coyote anodized receiver finish
• Modular platform: supports caliber conversion to 7.62x51, 6.5 Creedmoor, and 13-inch barrels

Specifications

Frequently Asked Questions

What caliber and barrel length does this MCX-Spear come with?

This model is chambered in 6.8x51 with a 16-inch barrel. The 6.8x51 is a new-generation intermediate cartridge designed for superior performance and ballistics compared to traditional 7.62 NATO.

Can I convert this rifle to a different caliber or barrel length?

Yes. The MCX-Spear platform supports modular caliber conversions to 7.62x51 and 6.5 Creedmoor, as well as 13-inch and 16-inch barrel length options, so you can adapt the rifle to different missions over time.

What magazines does the MCX-Spear use, and how many come with it?

The rifle uses standard AR-10 pattern magazines. One 20-round steel magazine is included with the rifle.

Does this rifle come with sights or an optic?

No. The MCX-Spear is optics-ready, meaning it's designed for mounting a scope or red dot of your choice. No iron sights or optics are included; you'll need to select and install your own.

Is the MCX-Spear ambidextrous?

Yes. The rifle features fully ambidextrous controls, including ambidextrous bolt and catch releases, rear and side non-reciprocating charging handles, and is equally suitable for left- and right-handed shooters.