SIG MCX carbine and MCX guns

Sig Sauer MCX Firearms

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SIG MCX Carbine and MCX Guns

Shop SIG MCX carbine, rifle, pistol, and SBR configurations from the MCX-SPEAR, MCX-SPEAR LT, and MCX-Rattler families. These piston-operated MCX guns support folding stocks, but their calibers, receiver sizes, barrel lengths, magazines, and intended roles are not interchangeable.

The full-size SIG MCX-SPEAR 6.8×51 mm rifle is the closest current commercial configuration to the M7 family. The lighter MCX-SPEAR LT 5.56 NATO carbine uses the smaller MCX-SPEAR LT platform. Compact SIG MCX-Rattler models prioritize shorter barrel configurations in select chamberings.

Choosing an MCX Carbine

Choose an MCX-SPEAR when you want the larger platform in 6.8×51 mm or 7.62×51 mm. Choose an MCX-SPEAR LT when you want the lighter MCX family in 5.56 NATO, .300 BLK, or 7.62×39 mm. Choose an MCX-Rattler when compact size is the priority. A 16-inch model is a rifle; shorter configurations may be sold as pistols or NFA-regulated short-barreled rifles, as identified on the individual product page.

Check the exact model for caliber, barrel length, stock or brace configuration, magazine capacity, finish, and current availability. Factory optics are included only when the product title and description specifically list one.

Frequently Asked Questions

What is the difference between MCX-SPEAR and SPEAR LT?

MCX-SPEAR is the civilian M7 in 6.8×51 and 7.62×51 with AR-10 magazines. SPEAR LT is the lighter folding MCX in 5.56, .300 BLK, and 7.62×39. Barrels, bolts, and magazines are not interchangeable across those families.

What is MCX SPEAR LT IR?

IR is SIG’s Gen II reduced-IR Cerakote on SPEAR LT. Same lighter folding MCX, with a coating SIG builds for lower signature under thermal and night vision.

Is an 11.5 in. MCX a rifle?

Not with a stock. An 11.5 in. barreled MCX with a stock is an NFA SBR. The 11.5 in. PMCX 10-round on this page is a pistol. Confirm the class on the firearm you receive.

Do these MCX guns ship with an optic?

No. A factory optic is not installed. The top rail is M1913.

How do SBR MCX models transfer?

Short-barreled rifles are NFA. They transfer on a Form 4 through a Class III / SOT dealer. Pistols and 16 in. rifles ship to a regular FFL.