First Look: SIG Sauer MCX SPEAR LT

The new Sig Sauer MCX-Spear LT is available in three different calibers with three different barrel lengths.

posted on September 27, 2022
Sig Sauer Mcx Spear LT

SIG Sauer has just released the latest iteration of its gas piston cycling MCX platform: the MCX SPEAR-LT. 

“The first generation of the MCX platform was designed to be an AR-15 style platform with added modularity. The second generation of the MCX, the MCX Virtus, was purpose-built for rugged durability and brought unprecedented modularity. Now comes the MCX-SPEAR-LT, which incorporates the best of both generations and is the culmination of the latest research, development, and innovation in the MCX platform,” said Tom Taylor, SIG Sauer’s Chief Marketing Officer and Executive Vice President, Commercial Sales. “The lightened handguard has the expected rigidity and durability of the MCX, the lower is a familiar SDI, M400-style lower and ambidextrous bolt catch and release that is designed to fit the legacy VIRTUS uppers for more versatility. The MCX-SPEAR-LT will accept AR-15 style triggers, in addition to the legacy triggers for even more flexibility in the MCX platform. With the MCX-SPEAR_LT also comes the long-awaited addition of the 7.62x39 caliber to the MCX family bringing even more modularity to a platform that simply can’t be matched. The evolution continues and the MCX-SPEAR-LT has raised the bar for modular weapons technology.” 

The MCX SPEAR-LT is available with three separate caliber choices and a few different configuration options. These include a full-size 16-inch carbine option in either 5.56mm NATO or 7.62x39mm Soviet in addition to both short barreled rifles or large format pistols with 11.5 inch barrels. The third caliber option for the MCX SPEAR-LT is .300 Blackout, and .300 Blackout firearms are available only with 9-inch barrels either as SBRs or large format pistols. Other than large format pistol versions, the SBR and full-size carbines have an integrated folding stock, as this MCX design does not rely on a traditional AR-15 receiver extension. The lower receivers are fully ambidextrous and also keep the best design aspects that shooters have come to enjoy from the AR-15 as well. 

For more information about the SIG Sauer MCX SPEAR-LT, the MCX family of rifles in general, and other firearms sold by SIG Sauer, please visit their website at


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