The new SIG Sauer MCX Spear LT series combines the best of the old Gen 1 MCX with the MCX Virtus and adds more caliber options. 

Back from the 1st generation of MCX rifles is the compatibility with standard AR trigger packs-- opening a world of modularity that was lost with the Virtus-- while also slimming the rifle down. Available in 5.56 NATO, .300 Blackout and 7.62x39-- new for the platform and a caliber unusual altogether for SIG, the Spear LT series also comes standard with SIG's SLX QD muzzle device/suppressor mount pre-installed while a redesigned handguard and other tweaks drop almost a pound in weight when compared to the Virtus.

 

The new SIG Sauer MCX Spear LT
The new SIG Sauer MCX Spear LT, bottom, compared to the legacy MCX, above. (Photo: Chris Eger/Guns.com)

 

Further, it now comes with an easier-to-operate side folding stock with a push-button release and an ambi bolt catch/release. Other standard features across the line include a Coyote (FDE) finish, a Nitrided barrel, fully ambi controls, and a flat blade match trigger. 

 

The new SIG Sauer MCX Spear LT
The new MCX Spear line comes standard with a Coyote finish. Note the slimmed-down handguard. (Photo: Chris Eger/Guns.com)
The new SIG Sauer MCX Spear LT
With an average weight of 7.5 pounds in its heaviest format, it is easy to see where the "LT" comes from in the SIG MCX Spear LT (Photo: Chris Eger/Guns.com)
SIG Sauer MCX Spear LT
Note the ambi surface controls. Lefties: rejoice! (Photo: Chris Eger/Guns.com)

 

SIG has the MCX Spear LT in eight different models on the schedule for this year. The standard carbine, available in 5.56 NATO and 7.62x39, runs about 7.5 pounds with a 16-inch barrel inside a 13-inch lightweight ergonomic handguard and has an overall length when folded of just 21.3 inches (34.3 inches with the stock extended).

 

SIG Sauer MCX Spear LT
The carbine format is the only configuration where the .300BLK isn't offered, because why would you want a 16-inch 300, right? Note the curved magazine of the 7.62x39 (Photos: SIG)

 

For those who like a short game, the MCX Spear LT will be offered in a pistol variant using 9-inch (.300BLK) or 11.5-inch barrels (5.56 NATO and 7.62x39) inside an 8- or 10-inch handguard, respectively. Each will have a short Pic rail on the rear of the receiver. 

 

SIG Sauer MCX Spear LT
The pistol format of the SIG Sauer MCX Spear LT is likely to be popular. (Photos: SIG) 

 

In factory SBRs, the company has a  9-inch .300BLK and 11.5-inch 5.56 and 7.62x39 complete with the factory-installed folding stock. Want to change out the barrel later, no problem, as they are interchangeable.

 

SIG Sauer MCX Spear LT
For stamp collectors or LE use, SIG is making three different factory SBR variants complete with the new style folding stock. (Photos: SIG)

 

The company developed the MCX series back around 2014 with a particular customer in mind and then transitioned it to fill both the demands of the military-- the Army's new 6.8mm Next Generation Squad Weapon-Automatic Rifle or NGSW-AR, adopted earlier this year as the XM5, is based on the MCX Spear, while SOCOM went with the shorty Rattler variant in 5.56/.300BLK -- and the consumer market, namely with the MCV Virtus line. With all that time and success in the rearview, SIG decided, rather than sit on its laurels, to instead push the platform to the next level. 

Guns.com spoke to Patrick Hanley, SIG Sauer Product Manager, Rifles, about the MCX program last month on a visit to New Hampshire.

"The MCX has been a platform that we've had roughly for almost a decade," said Hanley. "We had customers asking for some of the changes that were partially from the first generation, being the lightweight version of the gun, as well as some of the other feature sets that it had like the AR trigger compatibility that they wanted to see carry over. So, we took the Virtus and all the best features of it and we said, 'How do we bring that back down to weight? How do we bring that feature set back to where we want it?' and that's why we are here today."

 

SIG Sauer MCX Spear LT
The SIG Sauer MCX Spear LT family is available in three calibers as well as in carbine, SBR, and pistol formats. (Photo: SIG)

 

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